Project modernization (#630)

* Fixed boats falling and a TP glitch #266

* Replaced every C-style cast with C++ ones

* Replaced every C-style cast with C++ ones

* Fixed boats falling and a TP glitch #266

* Updated NULL to nullptr and fixing some type issues

* Modernized and fixed a few bugs

- Replaced most instances of `NULL` with `nullptr`.
- Replaced most `shared_ptr(new ...)` with `make_shared`.
- Removed the `nullptr` macro as it was interfering with the actual nullptr keyword in some instances.

* Fixing more conflicts

* Replace int loops with size_t and start work on overrides

Minecraft.World/ZonedChunkStorage.cpp

@@ -62,8 +62,8 @@ ZoneFile *ZonedChunkStorage::getZoneFile(int x, int z, bool create)
 
 		if ( !file.exists() )
 		{
-            if (!create) return NULL;
-			HANDLE ch = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+            if (!create) return nullptr;
+			HANDLE ch = CreateFile(wstringtofilename(file.getPath()), GENERIC_READ | GENERIC_WRITE, 0, nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
 			CloseHandle(ch);
         }
 
@@ -76,7 +76,7 @@ ZoneFile *ZonedChunkStorage::getZoneFile(int x, int z, bool create)
     zoneFile->lastUse = tickCount;
     if (!zoneFile->containsSlot(slot))
 	{
-        if (!create) return NULL;
+        if (!create) return nullptr;
     }
     return zoneFile;
 
@@ -85,14 +85,14 @@ ZoneFile *ZonedChunkStorage::getZoneFile(int x, int z, bool create)
 ZoneIo *ZonedChunkStorage::getBuffer(int x, int z, bool create)
 {
     ZoneFile *zoneFile = getZoneFile(x, z, create);
-    if (zoneFile == NULL) return NULL;
+    if (zoneFile == nullptr) return nullptr;
     return zoneFile->getZoneIo(getSlot(x, z));
 }
 
 LevelChunk *ZonedChunkStorage::load(Level *level, int x, int z)
 {
     ZoneIo *zoneIo = getBuffer(x, z, false);
-    if (zoneIo == NULL) return NULL;
+    if (zoneIo == nullptr) return nullptr;
 
     LevelChunk *lc = new LevelChunk(level, x, z);
     lc->unsaved = false;