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/FireTile.cpp

@@ -24,7 +24,7 @@ FireTile::FireTile(int id) : Tile(id, Material::fire,isSolidRender())
 	burnOdds = new int[256];
 	memset( burnOdds,0,sizeof(int)*256);
 
-	icons = NULL;
+	icons = nullptr;
 
 	setTicking(true);
 }
@@ -64,7 +64,7 @@ void FireTile::setFlammable(int id, int flame, int burn)
 
 AABB *FireTile::getAABB(Level *level, int x, int y, int z)
 {
-	return NULL;
+	return nullptr;
 }
 
 bool FireTile::blocksLight()