11 files changed, 221 insertions, 221 deletions

diff --git a/src/Bindings/DeprecatedBindings.cpp b/src/Bindings/DeprecatedBindings.cpp
index 02aa15be4..ded7a0142 100644
--- a/src/Bindings/DeprecatedBindings.cpp
+++ b/src/Bindings/DeprecatedBindings.cpp
@@ -29,7 +29,7 @@ static int tolua_get_AllToLua_g_BlockLightValue(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushnumber(tolua_S, (lua_Number)cBlockInfo::GetLightValue((BLOCKTYPE)BlockType));
 	return 1;
@@ -55,7 +55,7 @@ static int tolua_get_AllToLua_g_BlockSpreadLightFalloff(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushnumber(tolua_S, (lua_Number)cBlockInfo::GetSpreadLightFalloff((BLOCKTYPE)BlockType));
 	return 1;
@@ -81,7 +81,7 @@ static int tolua_get_AllToLua_g_BlockTransparent(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, cBlockInfo::IsTransparent((BLOCKTYPE)BlockType));
 	return 1;
@@ -107,7 +107,7 @@ static int tolua_get_AllToLua_g_BlockOneHitDig(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, cBlockInfo::IsOneHitDig((BLOCKTYPE)BlockType));
 	return 1;
@@ -133,7 +133,7 @@ static int tolua_get_AllToLua_g_BlockPistonBreakable(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, cBlockInfo::IsPistonBreakable((BLOCKTYPE)BlockType));
 	return 1;
@@ -159,7 +159,7 @@ static int tolua_get_AllToLua_g_BlockIsSnowable(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, cBlockInfo::IsSnowable((BLOCKTYPE)BlockType));
 	return 1;
@@ -185,7 +185,7 @@ static int tolua_get_AllToLua_g_BlockIsSolid(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, (bool)cBlockInfo::IsSolid((BLOCKTYPE)BlockType));
 	return 1;
@@ -211,7 +211,7 @@ static int tolua_get_AllToLua_g_BlockFullyOccupiesVoxel(lua_State* tolua_S)
 	BlockType = (int)tolua_tonumber(tolua_S, 2, 0);
 	if ((BlockType < 0) || (BlockType > E_BLOCK_MAX_TYPE_ID))
 	{
-		tolua_error(tolua_S, "array indexing out of range.", NULL);
+		tolua_error(tolua_S, "array indexing out of range.", nullptr);
 	}
 	tolua_pushboolean(tolua_S, (bool)cBlockInfo::FullyOccupiesVoxel((BLOCKTYPE)BlockType));
 	return 1;
@@ -224,16 +224,16 @@ static int tolua_get_AllToLua_g_BlockFullyOccupiesVoxel(lua_State* tolua_S)
 
 void DeprecatedBindings::Bind(lua_State * tolua_S)
 {
-	tolua_beginmodule(tolua_S, NULL);
-
-	tolua_array(tolua_S, "g_BlockLightValue",          tolua_get_AllToLua_g_BlockLightValue,          NULL);
-	tolua_array(tolua_S, "g_BlockSpreadLightFalloff",  tolua_get_AllToLua_g_BlockSpreadLightFalloff,  NULL);
-	tolua_array(tolua_S, "g_BlockTransparent",         tolua_get_AllToLua_g_BlockTransparent,         NULL);
-	tolua_array(tolua_S, "g_BlockOneHitDig",           tolua_get_AllToLua_g_BlockOneHitDig,           NULL);
-	tolua_array(tolua_S, "g_BlockPistonBreakable",     tolua_get_AllToLua_g_BlockPistonBreakable,     NULL);
-	tolua_array(tolua_S, "g_BlockIsSnowable",          tolua_get_AllToLua_g_BlockIsSnowable,          NULL);
-	tolua_array(tolua_S, "g_BlockIsSolid",             tolua_get_AllToLua_g_BlockIsSolid,             NULL);
-	tolua_array(tolua_S, "g_BlockFullyOccupiesVoxel",  tolua_get_AllToLua_g_BlockFullyOccupiesVoxel,  NULL);
+	tolua_beginmodule(tolua_S, nullptr);
+
+	tolua_array(tolua_S, "g_BlockLightValue",          tolua_get_AllToLua_g_BlockLightValue,          nullptr);
+	tolua_array(tolua_S, "g_BlockSpreadLightFalloff",  tolua_get_AllToLua_g_BlockSpreadLightFalloff,  nullptr);
+	tolua_array(tolua_S, "g_BlockTransparent",         tolua_get_AllToLua_g_BlockTransparent,         nullptr);
+	tolua_array(tolua_S, "g_BlockOneHitDig",           tolua_get_AllToLua_g_BlockOneHitDig,           nullptr);
+	tolua_array(tolua_S, "g_BlockPistonBreakable",     tolua_get_AllToLua_g_BlockPistonBreakable,     nullptr);
+	tolua_array(tolua_S, "g_BlockIsSnowable",          tolua_get_AllToLua_g_BlockIsSnowable,          nullptr);
+	tolua_array(tolua_S, "g_BlockIsSolid",             tolua_get_AllToLua_g_BlockIsSolid,             nullptr);
+	tolua_array(tolua_S, "g_BlockFullyOccupiesVoxel",  tolua_get_AllToLua_g_BlockFullyOccupiesVoxel,  nullptr);
 
 	tolua_endmodule(tolua_S);
 }
diff --git a/src/Bindings/LuaChunkStay.cpp b/src/Bindings/LuaChunkStay.cpp
index 23da12f68..e50ffb75b 100644
--- a/src/Bindings/LuaChunkStay.cpp
+++ b/src/Bindings/LuaChunkStay.cpp
@@ -13,7 +13,7 @@
 
 cLuaChunkStay::cLuaChunkStay(cPluginLua & a_Plugin) :
 	m_Plugin(a_Plugin),
-	m_LuaState(NULL)
+	m_LuaState(nullptr)
 {
 }
 
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index f8e026061..2f5d173fd 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -46,7 +46,7 @@ const cLuaState::cRet cLuaState::Return = {};
 // cLuaState:
 
 cLuaState::cLuaState(const AString & a_SubsystemName) :
-	m_LuaState(NULL),
+	m_LuaState(nullptr),
 	m_IsOwned(false),
 	m_SubsystemName(a_SubsystemName),
 	m_NumCurrentFunctionArgs(-1)
@@ -90,7 +90,7 @@ cLuaState::~cLuaState()
 
 void cLuaState::Create(void)
 {
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		LOGWARNING("%s: Trying to create an already-existing LuaState, ignoring.", __FUNCTION__);
 		return;
@@ -119,7 +119,7 @@ void cLuaState::RegisterAPILibs(void)
 
 void cLuaState::Close(void)
 {
-	if (m_LuaState == NULL)
+	if (m_LuaState == nullptr)
 	{
 		LOGWARNING("%s: Trying to close an invalid LuaState, ignoring.", __FUNCTION__);
 		return;
@@ -134,7 +134,7 @@ void cLuaState::Close(void)
 		return;
 	}
 	lua_close(m_LuaState);
-	m_LuaState = NULL;
+	m_LuaState = nullptr;
 	m_IsOwned = false;
 }
 
@@ -144,7 +144,7 @@ void cLuaState::Close(void)
 
 void cLuaState::Attach(lua_State * a_State)
 {
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		LOGINFO("%s: Already contains a LuaState (0x%p), will be closed / detached.", __FUNCTION__, m_LuaState);
 		if (m_IsOwned)
@@ -166,7 +166,7 @@ void cLuaState::Attach(lua_State * a_State)
 
 void cLuaState::Detach(void)
 {
-	if (m_LuaState == NULL)
+	if (m_LuaState == nullptr)
 	{
 		return;
 	}
@@ -179,7 +179,7 @@ void cLuaState::Detach(void)
 		Close();
 		return;
 	}
-	m_LuaState = NULL;
+	m_LuaState = nullptr;
 }
 
 
@@ -869,7 +869,7 @@ void cLuaState::GetStackValue(int a_StackPos, AString & a_Value)
 {
 	size_t len = 0;
 	const char * data = lua_tolstring(m_LuaState, a_StackPos, &len);
-	if (data != NULL)
+	if (data != nullptr)
 	{
 		a_Value.assign(data, len);
 	}
@@ -919,7 +919,7 @@ void cLuaState::GetStackValue(int a_StackPos, pBoundingBox & a_ReturnedVal)
 {
 	if (lua_isnil(m_LuaState, a_StackPos))
 	{
-		a_ReturnedVal = NULL;
+		a_ReturnedVal = nullptr;
 		return;
 	}
 	tolua_Error err;
@@ -937,7 +937,7 @@ void cLuaState::GetStackValue(int a_StackPos, pWorld & a_ReturnedVal)
 {
 	if (lua_isnil(m_LuaState, a_StackPos))
 	{
-		a_ReturnedVal = NULL;
+		a_ReturnedVal = nullptr;
 		return;
 	}
 	tolua_Error err;
@@ -1002,7 +1002,7 @@ bool cLuaState::CheckParamUserTable(int a_StartParam, const char * a_UserTable,
 		lua_Debug entry;
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
+		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1035,7 +1035,7 @@ bool cLuaState::CheckParamUserType(int a_StartParam, const char * a_UserType, in
 		lua_Debug entry;
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
+		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1068,7 +1068,7 @@ bool cLuaState::CheckParamTable(int a_StartParam, int a_EndParam)
 		lua_Debug entry;
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
+		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1101,7 +1101,7 @@ bool cLuaState::CheckParamNumber(int a_StartParam, int a_EndParam)
 		lua_Debug entry;
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
+		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1134,7 +1134,7 @@ bool cLuaState::CheckParamString(int a_StartParam, int a_EndParam)
 		lua_Debug entry;
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
+		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1167,7 +1167,7 @@ bool cLuaState::CheckParamFunction(int a_StartParam, int a_EndParam)
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
 		luaL_error(m_LuaState, "Error in function '%s' parameter #%d. Function expected, got %s",
-			(entry.name != NULL) ? entry.name : "?", i, GetTypeText(i).c_str()
+			(entry.name != nullptr) ? entry.name : "?", i, GetTypeText(i).c_str()
 		);
 		return false;
 	}  // for i - Param
@@ -1200,7 +1200,7 @@ bool cLuaState::CheckParamFunctionOrNil(int a_StartParam, int a_EndParam)
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
 		luaL_error(m_LuaState, "Error in function '%s' parameter #%d. Function expected, got %s",
-			(entry.name != NULL) ? entry.name : "?", i, GetTypeText(i).c_str()
+			(entry.name != nullptr) ? entry.name : "?", i, GetTypeText(i).c_str()
 		);
 		return false;
 	}  // for i - Param
@@ -1224,7 +1224,7 @@ bool cLuaState::CheckParamEnd(int a_Param)
 	lua_Debug entry;
 	VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 	VERIFY(lua_getinfo (m_LuaState, "n", &entry));
-	AString ErrMsg = Printf("#ferror in function '%s': Too many arguments.", (entry.name != NULL) ? entry.name : "?");
+	AString ErrMsg = Printf("#ferror in function '%s': Too many arguments.", (entry.name != nullptr) ? entry.name : "?");
 	tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 	return false;
 }
@@ -1403,7 +1403,7 @@ int cLuaState::CopyStackFrom(cLuaState & a_SrcLuaState, int a_SrcStart, int a_Sr
 			case LUA_TUSERDATA:
 			{
 				// Get the class name:
-				const char * type = NULL;
+				const char * type = nullptr;
 				if (lua_getmetatable(a_SrcLuaState, i) == 0)
 				{
 					LOGWARNING("%s: Unknown class in pos %d, cannot copy.", __FUNCTION__, i);
@@ -1415,7 +1415,7 @@ int cLuaState::CopyStackFrom(cLuaState & a_SrcLuaState, int a_SrcStart, int a_Sr
 				lua_pop(a_SrcLuaState, 1);                     // Stack -1
 				
 				// Copy the value:
-				void * ud = tolua_touserdata(a_SrcLuaState, i, NULL);
+				void * ud = tolua_touserdata(a_SrcLuaState, i, nullptr);
 				tolua_pushusertype(m_LuaState, ud, type);
 				break;
 			}
@@ -1441,7 +1441,7 @@ void cLuaState::ToString(int a_StackPos, AString & a_String)
 {
 	size_t len;
 	const char * s = lua_tolstring(m_LuaState, a_StackPos, &len);
-	if (s != NULL)
+	if (s != nullptr)
 	{
 		a_String.assign(s, len);
 	}
@@ -1463,7 +1463,7 @@ void cLuaState::LogStack(const char * a_Header)
 void cLuaState::LogStack(lua_State * a_LuaState, const char * a_Header)
 {
 	// Format string consisting only of %s is used to appease the compiler
-	LOG("%s", (a_Header != NULL) ? a_Header : "Lua C API Stack contents:");
+	LOG("%s", (a_Header != nullptr) ? a_Header : "Lua C API Stack contents:");
 	for (int i = lua_gettop(a_LuaState); i > 0; i--)
 	{
 		AString Value;
@@ -1500,7 +1500,7 @@ int cLuaState::ReportFnCallErrors(lua_State * a_LuaState)
 // cLuaState::cRef:
 
 cLuaState::cRef::cRef(void) :
-	m_LuaState(NULL),
+	m_LuaState(nullptr),
 	m_Ref(LUA_REFNIL)
 {
 }
@@ -1510,7 +1510,7 @@ cLuaState::cRef::cRef(void) :
 
 
 cLuaState::cRef::cRef(cLuaState & a_LuaState, int a_StackPos) :
-	m_LuaState(NULL),
+	m_LuaState(nullptr),
 	m_Ref(LUA_REFNIL)
 {
 	RefStack(a_LuaState, a_StackPos);
@@ -1522,7 +1522,7 @@ cLuaState::cRef::cRef(cLuaState & a_LuaState, int a_StackPos) :
 
 cLuaState::cRef::~cRef()
 {
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		UnRef();
 	}
@@ -1535,7 +1535,7 @@ cLuaState::cRef::~cRef()
 void cLuaState::cRef::RefStack(cLuaState & a_LuaState, int a_StackPos)
 {
 	ASSERT(a_LuaState.IsValid());
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		UnRef();
 	}
@@ -1556,7 +1556,7 @@ void cLuaState::cRef::UnRef(void)
 	{
 		luaL_unref(*m_LuaState, LUA_REGISTRYINDEX, m_Ref);
 	}
-	m_LuaState = NULL;
+	m_LuaState = nullptr;
 	m_Ref = LUA_REFNIL;
 }
 
diff --git a/src/Bindings/LuaState.h b/src/Bindings/LuaState.h
index 899228a66..d1e9923b4 100644
--- a/src/Bindings/LuaState.h
+++ b/src/Bindings/LuaState.h
@@ -164,7 +164,7 @@ public:
 	void Detach(void);
 	
 	/** Returns true if the m_LuaState is valid */
-	bool IsValid(void) const { return (m_LuaState != NULL); }
+	bool IsValid(void) const { return (m_LuaState != nullptr); }
 	
 	/** Adds the specified path to package.<a_PathVariable> */
 	void AddPackagePath(const AString & a_PathVariable, const AString & a_Path);
@@ -318,10 +318,10 @@ public:
 	void ToString(int a_StackPos, AString & a_String);
 
 	/** Logs all the elements' types on the API stack, with an optional header for the listing. */
-	void LogStack(const char * a_Header = NULL);
+	void LogStack(const char * a_Header = nullptr);
 	
 	/** Logs all the elements' types on the API stack, with an optional header for the listing. */
-	static void LogStack(lua_State * a_LuaState, const char * a_Header = NULL);
+	static void LogStack(lua_State * a_LuaState, const char * a_Header = nullptr);
 	
 protected:
 
diff --git a/src/Bindings/LuaWindow.cpp b/src/Bindings/LuaWindow.cpp
index c4d03b86b..35730878d 100644
--- a/src/Bindings/LuaWindow.cpp
+++ b/src/Bindings/LuaWindow.cpp
@@ -18,7 +18,7 @@
 cLuaWindow::cLuaWindow(cWindow::WindowType a_WindowType, int a_SlotsX, int a_SlotsY, const AString & a_Title) :
 	super(a_WindowType, a_Title),
 	m_Contents(a_SlotsX, a_SlotsY),
-	m_Plugin(NULL),
+	m_Plugin(nullptr),
 	m_LuaRef(LUA_REFNIL),
 	m_OnClosingFnRef(LUA_REFNIL),
 	m_OnSlotChangedFnRef(LUA_REFNIL)
@@ -70,7 +70,7 @@ cLuaWindow::~cLuaWindow()
 void cLuaWindow::SetLuaRef(cPluginLua * a_Plugin, int a_LuaRef)
 {
 	// Either m_Plugin is not set or equal to the passed plugin; only one plugin can use one cLuaWindow object
-	ASSERT((m_Plugin == NULL) || (m_Plugin == a_Plugin));
+	ASSERT((m_Plugin == nullptr) || (m_Plugin == a_Plugin));
 	ASSERT(m_LuaRef == LUA_REFNIL);
 	m_Plugin = a_Plugin;
 	m_LuaRef = a_LuaRef;
@@ -82,7 +82,7 @@ void cLuaWindow::SetLuaRef(cPluginLua * a_Plugin, int a_LuaRef)
 
 bool cLuaWindow::IsLuaReferenced(void) const
 {
-	return ((m_Plugin != NULL) && (m_LuaRef != LUA_REFNIL));
+	return ((m_Plugin != nullptr) && (m_LuaRef != LUA_REFNIL));
 }
 
 
@@ -92,7 +92,7 @@ bool cLuaWindow::IsLuaReferenced(void) const
 void cLuaWindow::SetOnClosing(cPluginLua * a_Plugin, int a_FnRef)
 {
 	// Either m_Plugin is not set or equal to the passed plugin; only one plugin can use one cLuaWindow object
-	ASSERT((m_Plugin == NULL) || (m_Plugin == a_Plugin));
+	ASSERT((m_Plugin == nullptr) || (m_Plugin == a_Plugin));
 	
 	// If there already was a function, unreference it first
 	if (m_OnClosingFnRef != LUA_REFNIL)
@@ -112,7 +112,7 @@ void cLuaWindow::SetOnClosing(cPluginLua * a_Plugin, int a_FnRef)
 void cLuaWindow::SetOnSlotChanged(cPluginLua * a_Plugin, int a_FnRef)
 {
 	// Either m_Plugin is not set or equal to the passed plugin; only one plugin can use one cLuaWindow object
-	ASSERT((m_Plugin == NULL) || (m_Plugin == a_Plugin));
+	ASSERT((m_Plugin == nullptr) || (m_Plugin == a_Plugin));
 	
 	// If there already was a function, unreference it first
 	if (m_OnSlotChangedFnRef != LUA_REFNIL)
@@ -134,7 +134,7 @@ bool cLuaWindow::ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse)
 	// First notify the plugin through the registered callback:
 	if (m_OnClosingFnRef != LUA_REFNIL)
 	{
-		ASSERT(m_Plugin != NULL);
+		ASSERT(m_Plugin != nullptr);
 		if (m_Plugin->CallbackWindowClosing(m_OnClosingFnRef, *this, a_Player, a_CanRefuse))
 		{
 			// The callback disagrees (the higher levels check the CanRefuse flag compliance)
@@ -153,7 +153,7 @@ void cLuaWindow::Destroy(void)
 {
 	super::Destroy();
 	
-	if ((m_LuaRef != LUA_REFNIL) && (m_Plugin != NULL))
+	if ((m_LuaRef != LUA_REFNIL) && (m_Plugin != nullptr))
 	{
 		// The object is referenced by Lua, un-reference it
 		m_Plugin->Unreference(m_LuaRef);
diff --git a/src/Bindings/ManualBindings.cpp b/src/Bindings/ManualBindings.cpp
index 0558533ce..a4a5d79b4 100644
--- a/src/Bindings/ManualBindings.cpp
+++ b/src/Bindings/ManualBindings.cpp
@@ -145,13 +145,13 @@ static AString GetLogMessage(lua_State * tolua_S)
 	tolua_Error err;
 	if (tolua_isusertype(tolua_S, 1, "cCompositeChat", false, &err))
 	{
-		return ((cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL))->ExtractText();
+		return ((cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr))->ExtractText();
 	}
 	else
 	{
 		size_t len = 0;
 		const char * str = lua_tolstring(tolua_S, 1, &len);
-		if (str != NULL)
+		if (str != nullptr)
 		{
 			return AString(str, len);
 		}
@@ -170,7 +170,7 @@ static int tolua_LOG(lua_State * tolua_S)
 	tolua_Error err;
 	if (tolua_isusertype(tolua_S, 1, "cCompositeChat", false, &err))
 	{
-		LogLevel = cCompositeChat::MessageTypeToLogLevel(((cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL))->GetMessageType());
+		LogLevel = cCompositeChat::MessageTypeToLogLevel(((cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr))->GetMessageType());
 	}
 	
 	// Log the message:
@@ -264,7 +264,7 @@ static cPluginLua * GetLuaPlugin(lua_State * L)
 	{
 		LOGWARNING("%s: cannot get plugin instance, what have you done to my Lua state?", __FUNCTION__);
 		lua_pop(L, 1);
-		return NULL;
+		return nullptr;
 	}
 	cPluginLua * Plugin = (cPluginLua *)lua_topointer(L, -1);
 	lua_pop(L, 1);
@@ -312,10 +312,10 @@ static int tolua_DoWith(lua_State* tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Requires 2 or 3 arguments, got %i", NumArgs);
 	}
 
-	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, NULL);
+	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, nullptr);
 
 	const char * ItemName = tolua_tocppstring(tolua_S, 2, "");
-	if ((ItemName == NULL) || (ItemName[0] == 0))
+	if ((ItemName == nullptr) || (ItemName[0] == 0))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a non-empty string for parameter #1", NumArgs);
 	}
@@ -406,7 +406,7 @@ static int tolua_DoWithID(lua_State* tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Requires 2 or 3 arguments, got %i", NumArgs);
 	}
 
-	Ty1 * self = (Ty1 *)tolua_tousertype(tolua_S, 1, NULL);
+	Ty1 * self = (Ty1 *)tolua_tousertype(tolua_S, 1, nullptr);
 
 	int ItemID = (int)tolua_tonumber(tolua_S, 2, 0);
 	if (!lua_isfunction(tolua_S, 3))
@@ -496,7 +496,7 @@ static int tolua_DoWithXYZ(lua_State* tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Requires 4 or 5 arguments, got %i", NumArgs);
 	}
 
-	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, NULL);
+	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, nullptr);
 	if (!lua_isnumber(tolua_S, 2) || !lua_isnumber(tolua_S, 3) || !lua_isnumber(tolua_S, 4))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a number for parameters #1, #2 and #3");
@@ -591,7 +591,7 @@ static int tolua_ForEachInChunk(lua_State * tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Requires 3 or 4 arguments, got %i", NumArgs);
 	}
 
-	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, NULL);
+	Ty1 * self = (Ty1 *)  tolua_tousertype(tolua_S, 1, nullptr);
 	if (!lua_isnumber(tolua_S, 2) || !lua_isnumber(tolua_S, 3))
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Expected a number for parameters #1 and #2");
@@ -694,10 +694,10 @@ static int tolua_ForEachInBox(lua_State * tolua_S)
 	}
 
 	// Get the params:
-	Ty1 * Self = NULL;
-	cBoundingBox * Box = NULL;
+	Ty1 * Self = nullptr;
+	cBoundingBox * Box = nullptr;
 	L.GetStackValues(1, Self, Box);
-	if ((Self == NULL) || (Box == NULL))
+	if ((Self == nullptr) || (Box == nullptr))
 	{
 		LOGWARNING("Invalid world (%p) or boundingbox (%p)", Self, Box);
 		L.LogStackTrace();
@@ -760,8 +760,8 @@ static int tolua_ForEach(lua_State * tolua_S)
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Requires 1 or 2 arguments, got %i", NumArgs);
 	}
 
-	Ty1 * self = (Ty1 *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	Ty1 * self = (Ty1 *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Not called on an object instance");
 	}
@@ -857,14 +857,14 @@ static int tolua_cWorld_GetBlockInfo(lua_State * tolua_S)
 	else
 	#endif
 	{
-		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, NULL);
+		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, nullptr);
 		int BlockX          = (int)      tolua_tonumber   (tolua_S, 2, 0);
 		int BlockY          = (int)      tolua_tonumber   (tolua_S, 3, 0);
 		int BlockZ          = (int)      tolua_tonumber   (tolua_S, 4, 0);
 		#ifndef TOLUA_RELEASE
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(tolua_S, "invalid 'self' in function 'GetBlockInfo'", NULL);
+			tolua_error(tolua_S, "invalid 'self' in function 'GetBlockInfo'", nullptr);
 		}
 		#endif
 		{
@@ -912,14 +912,14 @@ static int tolua_cWorld_GetBlockTypeMeta(lua_State * tolua_S)
 	else
 	#endif
 	{
-		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, NULL);
+		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, nullptr);
 		int BlockX          = (int)      tolua_tonumber   (tolua_S, 2, 0);
 		int BlockY          = (int)      tolua_tonumber   (tolua_S, 3, 0);
 		int BlockZ          = (int)      tolua_tonumber   (tolua_S, 4, 0);
 		#ifndef TOLUA_RELEASE
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(tolua_S, "invalid 'self' in function 'GetBlockTypeMeta'", NULL);
+			tolua_error(tolua_S, "invalid 'self' in function 'GetBlockTypeMeta'", nullptr);
 		}
 		#endif
 		{
@@ -964,14 +964,14 @@ static int tolua_cWorld_GetSignLines(lua_State * tolua_S)
 	else
 	#endif
 	{
-		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, NULL);
+		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, nullptr);
 		int BlockX          = (int)      tolua_tonumber   (tolua_S, 2, 0);
 		int BlockY          = (int)      tolua_tonumber   (tolua_S, 3, 0);
 		int BlockZ          = (int)      tolua_tonumber   (tolua_S, 4, 0);
 		#ifndef TOLUA_RELEASE
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(tolua_S, "invalid 'self' in function 'GetSignLines'", NULL);
+			tolua_error(tolua_S, "invalid 'self' in function 'GetSignLines'", nullptr);
 		}
 		#endif
 		{
@@ -1022,7 +1022,7 @@ static int tolua_cWorld_SetSignLines(lua_State * tolua_S)
 	else
 	#endif
 	{
-		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, NULL);
+		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, nullptr);
 		int BlockX          = (int)      tolua_tonumber   (tolua_S, 2, 0);
 		int BlockY          = (int)      tolua_tonumber   (tolua_S, 3, 0);
 		int BlockZ          = (int)      tolua_tonumber   (tolua_S, 4, 0);
@@ -1030,11 +1030,11 @@ static int tolua_cWorld_SetSignLines(lua_State * tolua_S)
 		const AString Line2 =            tolua_tocppstring(tolua_S, 6, 0);
 		const AString Line3 =            tolua_tocppstring(tolua_S, 7, 0);
 		const AString Line4 =            tolua_tocppstring(tolua_S, 8, 0);
-		cPlayer * Player    = (cPlayer *)tolua_tousertype (tolua_S, 9, NULL);
+		cPlayer * Player    = (cPlayer *)tolua_tousertype (tolua_S, 9, nullptr);
 		#ifndef TOLUA_RELEASE
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(tolua_S, "invalid 'self' in function 'SetSignLines' / 'UpdateSign'", NULL);
+			tolua_error(tolua_S, "invalid 'self' in function 'SetSignLines' / 'UpdateSign'", nullptr);
 		}
 		#endif
 		{
@@ -1071,13 +1071,13 @@ static int tolua_cWorld_TryGetHeight(lua_State * tolua_S)
 	else
 	#endif
 	{
-		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, NULL);
+		cWorld * self       = (cWorld *) tolua_tousertype (tolua_S, 1, nullptr);
 		int BlockX          = (int)      tolua_tonumber   (tolua_S, 2, 0);
 		int BlockZ          = (int)      tolua_tonumber   (tolua_S, 3, 0);
 		#ifndef TOLUA_RELEASE
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(tolua_S, "Invalid 'self' in function 'TryGetHeight'", NULL);
+			tolua_error(tolua_S, "Invalid 'self' in function 'TryGetHeight'", nullptr);
 		}
 		#endif
 		{
@@ -1136,15 +1136,15 @@ static int tolua_cWorld_QueueTask(lua_State * tolua_S)
 	
 	// Retrieve the cPlugin from the LuaState:
 	cPluginLua * Plugin = GetLuaPlugin(tolua_S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		// An error message has been already printed in GetLuaPlugin()
 		return 0;
 	}
 
 	// Retrieve the args:
-	cWorld * self = (cWorld *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cWorld * self = (cWorld *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Not called on an object instance");
 	}
@@ -1200,7 +1200,7 @@ static int tolua_cWorld_ScheduleTask(lua_State * tolua_S)
 	
 	// Retrieve the cPlugin from the LuaState:
 	cPluginLua * Plugin = GetLuaPlugin(tolua_S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		// An error message has been already printed in GetLuaPlugin()
 		return 0;
@@ -1216,8 +1216,8 @@ static int tolua_cWorld_ScheduleTask(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cWorld * World = (cWorld *)tolua_tousertype(tolua_S, 1, NULL);
-	if (World == NULL)
+	cWorld * World = (cWorld *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (World == nullptr)
 	{
 		return lua_do_error(tolua_S, "Error in function call '#funcname#': Not called on an object instance");
 	}
@@ -1241,7 +1241,7 @@ static int tolua_cWorld_ScheduleTask(lua_State * tolua_S)
 
 static int tolua_cPluginManager_GetAllPlugins(lua_State * tolua_S)
 {
-	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, NULL);
+	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, nullptr);
 
 	const cPluginManager::PluginMap & AllPlugins = self->GetAllPlugins();
 
@@ -1252,7 +1252,7 @@ static int tolua_cPluginManager_GetAllPlugins(lua_State * tolua_S)
 	{
 		const cPlugin* Plugin = iter->second;
 		tolua_pushstring(tolua_S, iter->first.c_str());
-		if (Plugin != NULL)
+		if (Plugin != nullptr)
 		{
 			tolua_pushusertype(tolua_S, (void *)Plugin, "const cPlugin");
 		}
@@ -1274,7 +1274,7 @@ static int tolua_cPluginManager_GetAllPlugins(lua_State * tolua_S)
 static int tolua_cPluginManager_GetCurrentPlugin(lua_State * S)
 {
 	cPluginLua * Plugin = GetLuaPlugin(S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		// An error message has already been printed in GetLuaPlugin()
 		return 0;
@@ -1305,7 +1305,7 @@ static int tolua_cPluginManager_AddHook_FnRef(cPluginManager * a_PluginManager,
 	
 	// Retrieve the cPlugin from the LuaState:
 	cPluginLua * Plugin = GetLuaPlugin(S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		// An error message has been already printed in GetLuaPlugin()
 		return 0;
@@ -1344,8 +1344,8 @@ static int tolua_cPluginManager_AddHook_DefFn(cPluginManager * a_PluginManager,
 	// The arg types have already been checked
 	
 	// Retrieve and check the cPlugin parameter
-	cPluginLua * Plugin = (cPluginLua *)tolua_tousertype(S, a_ParamIdx, NULL);
-	if (Plugin == NULL)
+	cPluginLua * Plugin = (cPluginLua *)tolua_tousertype(S, a_ParamIdx, nullptr);
+	if (Plugin == nullptr)
 	{
 		LOGWARNING("cPluginManager.AddHook(): Invalid Plugin parameter, expected a valid cPlugin object. Hook not added");
 		S.LogStackTrace();
@@ -1370,7 +1370,7 @@ static int tolua_cPluginManager_AddHook_DefFn(cPluginManager * a_PluginManager,
 	
 	// Get the standard name for the callback function:
 	const char * FnName = cPluginLua::GetHookFnName(HookType);
-	if (FnName == NULL)
+	if (FnName == nullptr)
 	{
 		LOGWARNING("cPluginManager.AddHook(): Unknown hook type (%d). Hook not added.", HookType);
 		S.LogStackTrace();
@@ -1417,8 +1417,8 @@ static int tolua_cPluginManager_AddHook(lua_State * tolua_S)
 	if (tolua_isusertype(S, 1, "cPluginManager", 0, &err))
 	{
 		// Style 2 or 3, retrieve the PlgMgr instance
-		PlgMgr = (cPluginManager *)tolua_tousertype(S, 1, NULL);
-		if (PlgMgr == NULL)
+		PlgMgr = (cPluginManager *)tolua_tousertype(S, 1, nullptr);
+		if (PlgMgr == nullptr)
 		{
 			LOGWARNING("Malformed plugin, use cPluginManager.AddHook(HOOK_TYPE, CallbackFunction). Fixing the call for you.");
 			S.LogStackTrace();
@@ -1465,8 +1465,8 @@ static int tolua_cPluginManager_ForEachCommand(lua_State * tolua_S)
 		return 0;
 	}
 
-	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		LOGWARN("Error in function call 'ForEachCommand': Not called on an object instance");
 		return 0;
@@ -1542,8 +1542,8 @@ static int tolua_cPluginManager_ForEachConsoleCommand(lua_State * tolua_S)
 		return 0;
 	}
 
-	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cPluginManager * self = (cPluginManager *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		LOGWARN("Error in function call 'ForEachConsoleCommand': Not called on an object instance");
 		return 0;
@@ -1617,7 +1617,7 @@ static int tolua_cPluginManager_BindCommand(lua_State * L)
 		cPluginManager.BindCommand(Command, Permission, Function, HelpString)  -- without the "self" param
 	*/
 	cPluginLua * Plugin = GetLuaPlugin(L);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		return 0;
 	}
@@ -1687,7 +1687,7 @@ static int tolua_cPluginManager_BindConsoleCommand(lua_State * L)
 	
 	// Get the plugin identification out of LuaState:
 	cPluginLua * Plugin = GetLuaPlugin(L);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		return 0;
 	}
@@ -1775,7 +1775,7 @@ static int tolua_cPluginManager_CallPlugin(lua_State * tolua_S)
 	
 	// If requesting calling the current plugin, refuse:
 	cPluginLua * ThisPlugin = GetLuaPlugin(L);
-	if (ThisPlugin == NULL)
+	if (ThisPlugin == nullptr)
 	{
 		return 0;
 	}
@@ -1843,14 +1843,14 @@ static int tolua_cWorld_ChunkStay(lua_State * tolua_S)
 	}
 	
 	cPluginLua * Plugin = GetLuaPlugin(tolua_S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		return 0;
 	}
 	
 	// Read the params:
-	cWorld * World = (cWorld *)tolua_tousertype(tolua_S, 1, NULL);
-	if (World == NULL)
+	cWorld * World = (cWorld *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (World == nullptr)
 	{
 		LOGWARNING("World:ChunkStay(): invalid world parameter");
 		L.LogStackTrace();
@@ -1862,7 +1862,7 @@ static int tolua_cWorld_ChunkStay(lua_State * tolua_S)
 	if (!ChunkStay->AddChunks(2))
 	{
 		delete ChunkStay;
-		ChunkStay = NULL;
+		ChunkStay = nullptr;
 		return 0;
 	}
 
@@ -1889,8 +1889,8 @@ static int tolua_cPlayer_GetPermissions(lua_State * tolua_S)
 	}
 
 	// Get the params:
-	cPlayer * self = (cPlayer *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cPlayer * self = (cPlayer *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		LOGWARNING("%s: invalid self (%p)", __FUNCTION__, self);
 		return 0;
@@ -1911,15 +1911,15 @@ static int tolua_cPlayer_OpenWindow(lua_State * tolua_S)
 
 	// Retrieve the plugin instance from the Lua state
 	cPluginLua * Plugin = GetLuaPlugin(tolua_S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		return 0;
 	}
 
 	// Get the parameters:
-	cPlayer * self = (cPlayer *)tolua_tousertype(tolua_S, 1, NULL);
-	cWindow * wnd  = (cWindow *)tolua_tousertype(tolua_S, 2, NULL);
-	if ((self == NULL) || (wnd == NULL))
+	cPlayer * self = (cPlayer *)tolua_tousertype(tolua_S, 1, nullptr);
+	cWindow * wnd  = (cWindow *)tolua_tousertype(tolua_S, 2, nullptr);
+	if ((self == nullptr) || (wnd == nullptr))
 	{
 		LOGWARNING("%s: invalid self (%p) or wnd (%p)", __FUNCTION__, self, wnd);
 		return 0;
@@ -1992,15 +1992,15 @@ static int tolua_SetObjectCallback(lua_State * tolua_S)
 
 	// Retrieve the plugin instance from the Lua state
 	cPluginLua * Plugin = GetLuaPlugin(tolua_S);
-	if (Plugin == NULL)
+	if (Plugin == nullptr)
 	{
 		// Warning message has already been printed by GetLuaPlugin(), bail out silently
 		return 0;
 	}
 
 	// Get the parameters - self and the function reference:
-	OBJTYPE * self = (OBJTYPE *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	OBJTYPE * self = (OBJTYPE *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
 		LOGWARNING("%s: invalid self (%p)", __FUNCTION__, self);
 		return 0;
@@ -2023,7 +2023,7 @@ static int tolua_SetObjectCallback(lua_State * tolua_S)
 
 static int tolua_cPluginLua_AddWebTab(lua_State * tolua_S)
 {
-	cPluginLua * self = (cPluginLua *)tolua_tousertype(tolua_S, 1, NULL);
+	cPluginLua * self = (cPluginLua *)tolua_tousertype(tolua_S, 1, nullptr);
 
 	tolua_Error tolua_err;
 	tolua_err.array = 0;
@@ -2067,7 +2067,7 @@ static int tolua_cPluginLua_AddWebTab(lua_State * tolua_S)
 
 static int tolua_cPluginLua_AddTab(lua_State* tolua_S)
 {
-	cPluginLua * self = (cPluginLua *) tolua_tousertype(tolua_S, 1, NULL);
+	cPluginLua * self = (cPluginLua *) tolua_tousertype(tolua_S, 1, nullptr);
 	LOGWARN("WARNING: Using deprecated function AddTab()! Use AddWebTab() instead. (plugin \"%s\" in folder \"%s\")",
 		self->GetName().c_str(), self->GetDirectory().c_str()
 	);
@@ -2087,7 +2087,7 @@ static int tolua_cPlugin_Call(lua_State * tolua_S)
 	L.LogStackTrace();
 	
 	// Retrieve the params: plugin and the function name to call
-	cPluginLua * TargetPlugin = (cPluginLua *) tolua_tousertype(tolua_S, 1, NULL);
+	cPluginLua * TargetPlugin = (cPluginLua *) tolua_tousertype(tolua_S, 1, nullptr);
 	AString FunctionName = tolua_tostring(tolua_S, 2, "");
 	
 	// Call the function:
@@ -2142,7 +2142,7 @@ static int tolua_push_StringStringMap(lua_State* tolua_S, std::map< std::string,
 
 static int tolua_get_HTTPRequest_Params(lua_State* tolua_S)
 {
-	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, NULL);
+	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, nullptr);
 	return tolua_push_StringStringMap(tolua_S, self->Params);
 }
 
@@ -2152,7 +2152,7 @@ static int tolua_get_HTTPRequest_Params(lua_State* tolua_S)
 
 static int tolua_get_HTTPRequest_PostParams(lua_State* tolua_S)
 {
-	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, NULL);
+	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, nullptr);
 	return tolua_push_StringStringMap(tolua_S, self->PostParams);
 }
 
@@ -2162,7 +2162,7 @@ static int tolua_get_HTTPRequest_PostParams(lua_State* tolua_S)
 
 static int tolua_get_HTTPRequest_FormData(lua_State* tolua_S)
 {
-	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, NULL);
+	HTTPRequest* self = (HTTPRequest*)  tolua_tousertype(tolua_S, 1, nullptr);
 	std::map< std::string, HTTPFormData >& FormData = self->FormData;
 
 	lua_newtable(tolua_S);
@@ -2185,7 +2185,7 @@ static int tolua_get_HTTPRequest_FormData(lua_State* tolua_S)
 
 static int tolua_cWebAdmin_GetPlugins(lua_State * tolua_S)
 {
-	cWebAdmin * self = (cWebAdmin *)tolua_tousertype(tolua_S, 1, NULL);
+	cWebAdmin * self = (cWebAdmin *)tolua_tousertype(tolua_S, 1, nullptr);
 
 	const cWebAdmin::PluginList & AllPlugins = self->GetPlugins();
 
@@ -2266,7 +2266,7 @@ static int tolua_AllToLua_cWebAdmin_GetURLEncodedString(lua_State * tolua_S)
 
 static int tolua_cWebPlugin_GetTabNames(lua_State * tolua_S)
 {
-	cWebPlugin* self = (cWebPlugin*)  tolua_tousertype(tolua_S, 1, NULL);
+	cWebPlugin* self = (cWebPlugin*)  tolua_tousertype(tolua_S, 1, nullptr);
 
 	const cWebPlugin::TabNameList & TabNames = self->GetTabNames();
 
@@ -2302,8 +2302,8 @@ static int tolua_cClientHandle_SendPluginMessage(lua_State * L)
 	{
 		return 0;
 	}
-	cClientHandle * Client = (cClientHandle *)tolua_tousertype(L, 1, NULL);
-	if (Client == NULL)
+	cClientHandle * Client = (cClientHandle *)tolua_tousertype(L, 1, nullptr);
+	if (Client == nullptr)
 	{
 		LOGWARNING("ClientHandle is nil in cClientHandle:SendPluginMessage()");
 		S.LogStackTrace();
@@ -2548,11 +2548,11 @@ static int Lua_ItemGrid_GetSlotCoords(lua_State * L)
 	}
 
 	{
-		const cItemGrid * self = (const cItemGrid *)tolua_tousertype(L, 1, NULL);
+		const cItemGrid * self = (const cItemGrid *)tolua_tousertype(L, 1, nullptr);
 		int SlotNum = (int)tolua_tonumber(L, 2, 0);
-		if (self == NULL)
+		if (self == nullptr)
 		{
-			tolua_error(L, "invalid 'self' in function 'cItemGrid:GetSlotCoords'", NULL);
+			tolua_error(L, "invalid 'self' in function 'cItemGrid:GetSlotCoords'", nullptr);
 			return 0;
 		}
 		int X, Y;
@@ -2689,7 +2689,7 @@ static int tolua_cLineBlockTracer_Trace(lua_State * tolua_S)
 	}
 
 	// Trace:
-	cWorld * World = (cWorld *)tolua_tousertype(L, idx, NULL);
+	cWorld * World = (cWorld *)tolua_tousertype(L, idx, nullptr);
 	cLuaBlockTracerCallbacks Callbacks(L, idx + 1);
 	double StartX = tolua_tonumber(L, idx + 2, 0);
 	double StartY = tolua_tonumber(L, idx + 3, 0);
@@ -2719,8 +2719,8 @@ static int tolua_cRoot_GetFurnaceRecipe(lua_State * tolua_S)
 	}
 	
 	// Check the input param:
-	cItem * Input = (cItem *)tolua_tousertype(L, 2, NULL);
-	if (Input == NULL)
+	cItem * Input = (cItem *)tolua_tousertype(L, 2, nullptr);
+	if (Input == nullptr)
 	{
 		LOGWARNING("cRoot:GetFurnaceRecipe: the Input parameter is nil or missing.");
 		return 0;
@@ -2729,7 +2729,7 @@ static int tolua_cRoot_GetFurnaceRecipe(lua_State * tolua_S)
 	// Get the recipe for the input
 	cFurnaceRecipe * FR = cRoot::Get()->GetFurnaceRecipe();
 	const cFurnaceRecipe::cRecipe * Recipe = FR->GetRecipeFrom(*Input);
-	if (Recipe == NULL)
+	if (Recipe == nullptr)
 	{
 		// There is no such furnace recipe for this input, return no value
 		return 0;
@@ -2760,10 +2760,10 @@ static int tolua_cHopperEntity_GetOutputBlockPos(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cHopperEntity * self = (cHopperEntity *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cHopperEntity * self = (cHopperEntity *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cHopperEntity::GetOutputBlockPos()'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cHopperEntity::GetOutputBlockPos()'", nullptr);
 		return 0;
 	}
 
@@ -2800,10 +2800,10 @@ static int tolua_cBlockArea_GetBlockTypeMeta(lua_State * tolua_S)
 		return 0;
 	}
 	
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetRelBlockTypeMeta'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetRelBlockTypeMeta'", nullptr);
 		return 0;
 	}
 	int BlockX = (int)tolua_tonumber(tolua_S, 2, 0);
@@ -2834,10 +2834,10 @@ static int tolua_cBlockArea_GetOrigin(lua_State * tolua_S)
 		return 0;
 	}
 	
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetOrigin'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetOrigin'", nullptr);
 		return 0;
 	}
 	
@@ -2866,10 +2866,10 @@ static int tolua_cBlockArea_GetRelBlockTypeMeta(lua_State * tolua_S)
 		return 0;
 	}
 	
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetRelBlockTypeMeta'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetRelBlockTypeMeta'", nullptr);
 		return 0;
 	}
 	int BlockX = (int)tolua_tonumber(tolua_S, 2, 0);
@@ -2900,10 +2900,10 @@ static int tolua_cBlockArea_GetSize(lua_State * tolua_S)
 		return 0;
 	}
 	
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetSize'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetSize'", nullptr);
 		return 0;
 	}
 	
@@ -2931,10 +2931,10 @@ static int tolua_cBlockArea_GetCoordRange(lua_State * tolua_S)
 		return 0;
 	}
 	
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetSize'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea:GetSize'", nullptr);
 		return 0;
 	}
 	
@@ -2962,10 +2962,10 @@ static int tolua_cBlockArea_LoadFromSchematicFile(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::LoadFromSchematicFile'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::LoadFromSchematicFile'", nullptr);
 		return 0;
 	}
 
@@ -2992,10 +2992,10 @@ static int tolua_cBlockArea_LoadFromSchematicString(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::LoadFromSchematicFile'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::LoadFromSchematicFile'", nullptr);
 		return 0;
 	}
 
@@ -3023,10 +3023,10 @@ static int tolua_cBlockArea_SaveToSchematicFile(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::SaveToSchematicFile'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::SaveToSchematicFile'", nullptr);
 		return 0;
 	}
 	AString Filename = tolua_tostring(tolua_S, 2, 0);
@@ -3051,10 +3051,10 @@ static int tolua_cBlockArea_SaveToSchematicString(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cBlockArea * self = (cBlockArea *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::SaveToSchematicFile'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cBlockArea::SaveToSchematicFile'", nullptr);
 		return 0;
 	}
 	
@@ -3085,10 +3085,10 @@ static int tolua_cCompositeChat_AddRunCommandPart(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddRunCommandPart'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddRunCommandPart'", nullptr);
 		return 0;
 	}
 	
@@ -3122,10 +3122,10 @@ static int tolua_cCompositeChat_AddSuggestCommandPart(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddSuggestCommandPart'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddSuggestCommandPart'", nullptr);
 		return 0;
 	}
 	
@@ -3159,10 +3159,10 @@ static int tolua_cCompositeChat_AddTextPart(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddTextPart'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddTextPart'", nullptr);
 		return 0;
 	}
 	
@@ -3195,10 +3195,10 @@ static int tolua_cCompositeChat_AddUrlPart(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddUrlPart'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:AddUrlPart'", nullptr);
 		return 0;
 	}
 	
@@ -3232,10 +3232,10 @@ static int tolua_cCompositeChat_ParseText(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:ParseText'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:ParseText'", nullptr);
 		return 0;
 	}
 	
@@ -3267,10 +3267,10 @@ static int tolua_cCompositeChat_SetMessageType(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:SetMessageType'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:SetMessageType'", nullptr);
 		return 0;
 	}
 	
@@ -3299,10 +3299,10 @@ static int tolua_cCompositeChat_UnderlineUrls(lua_State * tolua_S)
 	{
 		return 0;
 	}
-	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, NULL);
-	if (self == NULL)
+	cCompositeChat * self = (cCompositeChat *)tolua_tousertype(tolua_S, 1, nullptr);
+	if (self == nullptr)
 	{
-		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:UnderlineUrls'", NULL);
+		tolua_error(tolua_S, "invalid 'self' in function 'cCompositeChat:UnderlineUrls'", nullptr);
 		return 0;
 	}
 	
@@ -3320,7 +3320,7 @@ static int tolua_cCompositeChat_UnderlineUrls(lua_State * tolua_S)
 
 void ManualBindings::Bind(lua_State * tolua_S)
 {
-	tolua_beginmodule(tolua_S, NULL);
+	tolua_beginmodule(tolua_S, nullptr);
 		tolua_function(tolua_S, "Clamp",              tolua_Clamp);
 		tolua_function(tolua_S, "StringSplit",        tolua_StringSplit);
 		tolua_function(tolua_S, "StringSplitAndTrim", tolua_StringSplitAndTrim);
@@ -3447,7 +3447,7 @@ void ManualBindings::Bind(lua_State * tolua_S)
 			tolua_function(tolua_S, "AddWebTab", tolua_cPluginLua_AddWebTab);
 		tolua_endmodule(tolua_S);
 
-		tolua_cclass(tolua_S, "HTTPRequest", "HTTPRequest", "", NULL);
+		tolua_cclass(tolua_S, "HTTPRequest", "HTTPRequest", "", nullptr);
 		tolua_beginmodule(tolua_S, "HTTPRequest");
 			// tolua_variable(tolua_S, "Method", tolua_get_HTTPRequest_Method, tolua_set_HTTPRequest_Method);
 			// tolua_variable(tolua_S, "Path", tolua_get_HTTPRequest_Path, tolua_set_HTTPRequest_Path);
diff --git a/src/Bindings/ManualBindings_RankManager.cpp b/src/Bindings/ManualBindings_RankManager.cpp
index 66174bf86..fa1b88b6a 100644
--- a/src/Bindings/ManualBindings_RankManager.cpp
+++ b/src/Bindings/ManualBindings_RankManager.cpp
@@ -1044,7 +1044,7 @@ void ManualBindings::BindRankManager(lua_State * tolua_S)
 {
 	// Create the cRankManager class in the API:
 	tolua_usertype(tolua_S, "cRankManager");
-	tolua_cclass(tolua_S, "cRankManager", "cRankManager", "", NULL);
+	tolua_cclass(tolua_S, "cRankManager", "cRankManager", "", nullptr);
 	
 	// Fill in the functions (alpha-sorted):
 	tolua_beginmodule(tolua_S, "cRankManager");
diff --git a/src/Bindings/PluginLua.cpp b/src/Bindings/PluginLua.cpp
index eec31e8a6..391d8bcbe 100644
--- a/src/Bindings/PluginLua.cpp
+++ b/src/Bindings/PluginLua.cpp
@@ -1487,7 +1487,7 @@ void cPluginLua::ClearCommands(void)
 	cCSLock Lock(m_CriticalSection);
 
 	// Unreference the bound functions so that Lua can GC them
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		for (CommandMap::iterator itr = m_Commands.begin(), end = m_Commands.end(); itr != end; ++itr)
 		{
@@ -1506,7 +1506,7 @@ void cPluginLua::ClearConsoleCommands(void)
 	cCSLock Lock(m_CriticalSection);
 
 	// Unreference the bound functions so that Lua can GC them
-	if (m_LuaState != NULL)
+	if (m_LuaState != nullptr)
 	{
 		for (CommandMap::iterator itr = m_ConsoleCommands.begin(), end = m_ConsoleCommands.end(); itr != end; ++itr)
 		{
@@ -1523,7 +1523,7 @@ void cPluginLua::ClearConsoleCommands(void)
 bool cPluginLua::CanAddOldStyleHook(int a_HookType)
 {
 	const char * FnName = GetHookFnName(a_HookType);
-	if (FnName == NULL)
+	if (FnName == nullptr)
 	{
 		// Unknown hook ID
 		LOGWARNING("Plugin %s wants to add an unknown hook ID (%d). The plugin need not work properly.",
@@ -1614,7 +1614,7 @@ const char * cPluginLua::GetHookFnName(int a_HookType)
 	}  // switch (a_Hook)
 	LOGWARNING("Requested name of an unknown hook type function: %d (max is %d)", a_HookType, cPluginManager::HOOK_MAX);
 	ASSERT(!"Unknown hook requested!");
-	return NULL;
+	return nullptr;
 }
 
 
@@ -1627,12 +1627,12 @@ bool cPluginLua::AddHookRef(int a_HookType, int a_FnRefIdx)
 	
 	// Check if the function reference is valid:
 	cLuaState::cRef * Ref = new cLuaState::cRef(m_LuaState, a_FnRefIdx);
-	if ((Ref == NULL) || !Ref->IsValid())
+	if ((Ref == nullptr) || !Ref->IsValid())
 	{
 		LOGWARNING("Plugin %s tried to add a hook %d with bad handler function.", GetName().c_str(), a_HookType);
 		m_LuaState.LogStackTrace();
 		delete Ref;
-		Ref = NULL;
+		Ref = nullptr;
 		return false;
 	}
 	
@@ -1700,7 +1700,7 @@ AString cPluginLua::HandleWebRequest(const HTTPRequest * a_Request)
 		}
 	}
 
-	if (Tab != NULL)
+	if (Tab != nullptr)
 	{
 		AString Contents = Printf("WARNING: WebPlugin tab '%s' did not return a string!", Tab->Title.c_str());
 		if (!m_LuaState.Call(Tab->UserData, a_Request, cLuaState::Return, Contents))
diff --git a/src/Bindings/PluginManager.cpp b/src/Bindings/PluginManager.cpp
index 479e71951..e549aefa3 100644
--- a/src/Bindings/PluginManager.cpp
+++ b/src/Bindings/PluginManager.cpp
@@ -66,7 +66,7 @@ void cPluginManager::FindPlugins(void)
 	// First get a clean list of only the currently running plugins, we don't want to mess those up
 	for (PluginMap::iterator itr = m_Plugins.begin(); itr != m_Plugins.end();)
 	{
-		if (itr->second == NULL)
+		if (itr->second == nullptr)
 		{
 			PluginMap::iterator thiz = itr;
 			++thiz;
@@ -89,7 +89,7 @@ void cPluginManager::FindPlugins(void)
 		// Add plugin name/directory to the list
 		if (m_Plugins.find(*itr) == m_Plugins.end())
 		{
-			m_Plugins[*itr] = NULL;
+			m_Plugins[*itr] = nullptr;
 		}
 	}
 }
@@ -151,7 +151,7 @@ void cPluginManager::ReloadPluginsNow(cIniFile & a_SettingsIni)
 	// Remove invalid plugins from the PluginMap.
 	for (PluginMap::iterator itr = m_Plugins.begin(); itr != m_Plugins.end();)
 	{
-		if (itr->second == NULL)
+		if (itr->second == nullptr)
 		{
 			PluginMap::iterator thiz = itr;
 			++thiz;
@@ -1445,7 +1445,7 @@ cPluginManager::CommandResult cPluginManager::HandleCommand(cPlayer & a_Player,
 		return crNoPermission;
 	}
 
-	ASSERT(cmd->second.m_Plugin != NULL);
+	ASSERT(cmd->second.m_Plugin != nullptr);
 
 	if (!cmd->second.m_Plugin->HandleCommand(Split, a_Player))
 	{
@@ -1463,7 +1463,7 @@ cPlugin * cPluginManager::GetPlugin( const AString & a_Plugin) const
 {
 	for (PluginMap::const_iterator itr = m_Plugins.begin(); itr != m_Plugins.end(); ++itr)
 	{
-		if (itr->second == NULL) continue;
+		if (itr->second == nullptr) continue;
 		if (itr->second->GetName().compare(a_Plugin) == 0)
 		{
 			return itr->second;
@@ -1513,7 +1513,7 @@ bool cPluginManager::DisablePlugin(const AString & a_PluginName)
 	if (itr->first.compare(a_PluginName) == 0)  // _X 2013_02_01: wtf? Isn't this supposed to be what find() does?
 	{
 		m_DisablePluginList.push_back(itr->second);
-		itr->second = NULL;  // Get rid of this thing right away
+		itr->second = nullptr;  // Get rid of this thing right away
 		return true;
 	}
 	return false;
@@ -1558,12 +1558,12 @@ void cPluginManager::RemovePlugin(cPlugin * a_Plugin)
 	RemovePluginCommands(a_Plugin);
 	RemovePluginConsoleCommands(a_Plugin);
 	RemoveHooks(a_Plugin);
-	if (a_Plugin != NULL)
+	if (a_Plugin != nullptr)
 	{
 		a_Plugin->OnDisable();
 	}
 	delete a_Plugin;
-	a_Plugin = NULL;
+	a_Plugin = nullptr;
 }
 
 
@@ -1572,7 +1572,7 @@ void cPluginManager::RemovePlugin(cPlugin * a_Plugin)
 
 void cPluginManager::RemovePluginCommands(cPlugin * a_Plugin)
 {
-	if (a_Plugin != NULL)
+	if (a_Plugin != nullptr)
 	{
 		a_Plugin->ClearCommands();
 	}
@@ -1670,7 +1670,7 @@ cPluginManager::CommandResult cPluginManager::ForceExecuteCommand(cPlayer & a_Pl
 
 void cPluginManager::RemovePluginConsoleCommands(cPlugin * a_Plugin)
 {
-	if (a_Plugin != NULL)
+	if (a_Plugin != nullptr)
 	{
 		a_Plugin->ClearConsoleCommands();
 	}
@@ -1699,7 +1699,7 @@ bool cPluginManager::BindConsoleCommand(const AString & a_Command, cPlugin * a_P
 	CommandMap::iterator cmd = m_ConsoleCommands.find(a_Command);
 	if (cmd != m_ConsoleCommands.end())
 	{
-		if (cmd->second.m_Plugin == NULL)
+		if (cmd->second.m_Plugin == nullptr)
 		{
 			LOGWARNING("Console command \"%s\" is already bound internally by MCServer, cannot bind in plugin \"%s\".", a_Command.c_str(), a_Plugin->GetName().c_str());
 		}
@@ -1759,14 +1759,14 @@ bool cPluginManager::ExecuteConsoleCommand(const AStringVector & a_Split, cComma
 		return false;
 	}
 
-	if (cmd->second.m_Plugin == NULL)
+	if (cmd->second.m_Plugin == nullptr)
 	{
 		// This is a built-in command
 		return false;
 	}
 
 	// Ask plugins first if a command is okay to execute the console command:
-	if (CallHookExecuteCommand(NULL, a_Split))
+	if (CallHookExecuteCommand(nullptr, a_Split))
 	{
 		a_Output.Out("Command \"%s\" was stopped by the HOOK_EXECUTE_COMMAND hook", a_Split[0].c_str());
 		return false;
@@ -1788,7 +1788,7 @@ void cPluginManager::TabCompleteCommand(const AString & a_Text, AStringVector &
 			// Command name doesn't match
 			continue;
 		}
-		if ((a_Player != NULL) && !a_Player->HasPermission(itr->second.m_Permission))
+		if ((a_Player != nullptr) && !a_Player->HasPermission(itr->second.m_Permission))
 		{
 			// Player doesn't have permission for the command
 			continue;
@@ -1814,7 +1814,7 @@ bool cPluginManager::DoWithPlugin(const AString & a_PluginName, cPluginCallback
 {
 	// TODO: Implement locking for plugins
 	PluginMap::iterator itr = m_Plugins.find(a_PluginName);
-	if ((itr == m_Plugins.end()) || (itr->second == NULL))
+	if ((itr == m_Plugins.end()) || (itr->second == nullptr))
 	{
 		return false;
 	}
@@ -1848,7 +1848,7 @@ void cPluginManager::AddHook(cPlugin * a_Plugin, int a_Hook)
 {
 	if (!a_Plugin)
 	{
-		LOGWARN("Called cPluginManager::AddHook() with a_Plugin == NULL");
+		LOGWARN("Called cPluginManager::AddHook() with a_Plugin == nullptr");
 		return;
 	}
 	PluginList & Plugins = m_Hooks[a_Hook];
diff --git a/src/Bindings/PluginManager.h b/src/Bindings/PluginManager.h
index c69850be6..bc8c1f5e6 100644
--- a/src/Bindings/PluginManager.h
+++ b/src/Bindings/PluginManager.h
@@ -190,7 +190,7 @@ public:
 	bool CallHookCraftingNoRecipe         (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe * a_Recipe);
 	bool CallHookDisconnect               (cClientHandle & a_Client, const AString & a_Reason);
 	bool CallHookEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier);
-	bool CallHookExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split);  // If a_Player == NULL, it is a console cmd
+	bool CallHookExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split);  // If a_Player == nullptr, it is a console cmd
 	bool CallHookExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
 	bool CallHookExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
 	bool CallHookHandshake                (cClientHandle & a_ClientHandle, const AString & a_Username);
@@ -285,7 +285,7 @@ public:
 	bool ExecuteConsoleCommand(const AStringVector & a_Split, cCommandOutputCallback & a_Output);
 	
 	/** Appends all commands beginning with a_Text (case-insensitive) into a_Results.
-	If a_Player is not NULL, only commands for which the player has permissions are added.
+	If a_Player is not nullptr, only commands for which the player has permissions are added.
 	*/
 	void TabCompleteCommand(const AString & a_Text, AStringVector & a_Results, cPlayer * a_Player);
 	
diff --git a/src/Bindings/WebPlugin.cpp b/src/Bindings/WebPlugin.cpp
index eca1c74e6..5759b20e7 100644
--- a/src/Bindings/WebPlugin.cpp
+++ b/src/Bindings/WebPlugin.cpp
@@ -12,7 +12,7 @@
 cWebPlugin::cWebPlugin()
 {
 	cWebAdmin * WebAdmin = cRoot::Get()->GetWebAdmin();
-	if (WebAdmin != NULL)
+	if (WebAdmin != nullptr)
 	{
 		WebAdmin->AddPlugin(this);
 	}
@@ -25,7 +25,7 @@ cWebPlugin::cWebPlugin()
 cWebPlugin::~cWebPlugin()
 {
 	cWebAdmin * WebAdmin = cRoot::Get()->GetWebAdmin();
-	if (WebAdmin != NULL)
+	if (WebAdmin != nullptr)
 	{
 		WebAdmin->RemovePlugin(this);
 	}
@@ -65,7 +65,7 @@ std::pair< AString, AString > cWebPlugin::GetTabNameForRequest(const HTTPRequest
 
 	if (Split.size() > 1)
 	{
-		sWebPluginTab * Tab = NULL;
+		sWebPluginTab * Tab = nullptr;
 		if (Split.size() > 2)  // If we got the tab name, show that page
 		{
 			for (TabList::iterator itr = GetTabs().begin(); itr != GetTabs().end(); ++itr)
@@ -85,7 +85,7 @@ std::pair< AString, AString > cWebPlugin::GetTabNameForRequest(const HTTPRequest
 			}
 		}
 
-		if (Tab != NULL)
+		if (Tab != nullptr)
 		{
 			Names.first = Tab->Title;
 			Names.second = Tab->SafeTitle;