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/BaseEntityTile.cpp

@@ -25,7 +25,7 @@ bool BaseEntityTile::triggerEvent(Level *level, int x, int y, int z, int b0, int
 {
 	Tile::triggerEvent(level, x, y, z, b0, b1);
 	shared_ptr<TileEntity> te = level->getTileEntity(x, y, z);
-	if (te != NULL)
+	if (te != nullptr)
 	{
 		return te->triggerEvent(b0, b1);
 	}