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/TopSnowTile.cpp

@@ -27,7 +27,7 @@ AABB *TopSnowTile::getAABB(Level *level, int x, int y, int z)
 {
 	int height = level->getData(x, y, z) & HEIGHT_MASK;
 	float offset = 2.0f / SharedConstants::WORLD_RESOLUTION;
-	ThreadStorage *tls = (ThreadStorage *)TlsGetValue(Tile::tlsIdxShape);
+	ThreadStorage *tls = static_cast<ThreadStorage *>(TlsGetValue(Tile::tlsIdxShape));
 	return AABB::newTemp(x + tls->xx0, y + tls->yy0, z + tls->zz0, x + tls->xx1, y + (height * offset), z + tls->zz1);
 }
 
@@ -100,7 +100,7 @@ void TopSnowTile::playerDestroy(Level *level, shared_ptr<Player> player, int x,
 {
 	int type = Item::snowBall->id;
 	int height = data & HEIGHT_MASK;
-	popResource(level, x, y, z, shared_ptr<ItemInstance>( new ItemInstance(type, height + 1, 0)));
+	popResource(level, x, y, z, std::make_shared<ItemInstance>(type, height + 1, 0));
 	level->removeTile(x, y, z);
 }