Modernize project codebase (#906)

* 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

* Add safety checks and fix a issue with vector going OOR

Minecraft.World/RegionFileCache.cpp

@@ -38,13 +38,13 @@ RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wst
 	}
 	MemSect(0);
 
-	RegionFile *ref = NULL;
+	RegionFile *ref = nullptr;
     auto it = cache.find(file);
     if( it != cache.end() )
 		ref = it->second;
 
 	// 4J Jev, put back in.
-    if (ref != NULL)
+    if (ref != nullptr)
 	{
 		return ref;
     }
@@ -72,7 +72,7 @@ void RegionFileCache::_clear()															// 4J - TODO was synchronized
 	for(auto& it : cache)
 	{
         RegionFile *regionFile = it.second;
-        if (regionFile != NULL)
+        if (regionFile != nullptr)
 		{
             regionFile->close();
         }