En masse NULL -> nullptr replace

src/BlockEntities/NoteEntity.h

@@ -42,7 +42,7 @@ public:
 
 	BLOCKENTITY_PROTODEF(cNoteEntity);
 	
-	/// Creates a new note entity. a_World may be NULL
+	/// Creates a new note entity. a_World may be nullptr
 	cNoteEntity(int a_X, int a_Y, int a_Z, cWorld * a_World);
 	virtual ~cNoteEntity() {}