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/BedItem.cpp

@@ -24,7 +24,7 @@ bool BedItem::useOn(shared_ptr<ItemInstance> itemInstance, shared_ptr<Player> pl
 	// place on top of tile
 	y = y + 1;
 
-	BedTile *tile = (BedTile *) Tile::bed;
+	BedTile *tile = static_cast<BedTile *>(Tile::bed);
 
 	int dir = ( Mth::floor(player->yRot * 4 / (360) + 0.5f) ) & 3;
 	int xra = 0;