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/EnderChestTileEntity.cpp

@@ -94,7 +94,7 @@ bool EnderChestTileEntity::stillValid(shared_ptr<Player> player)
 // 4J Added
 shared_ptr<TileEntity> EnderChestTileEntity::clone()
 {
-	shared_ptr<EnderChestTileEntity> result = shared_ptr<EnderChestTileEntity>( new EnderChestTileEntity() );
+	shared_ptr<EnderChestTileEntity> result = std::make_shared<EnderChestTileEntity>();
 	TileEntity::clone(result);
 
 	return result;