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/NetherWartTile.cpp

@@ -84,7 +84,7 @@ void NetherWartTile::spawnResources(Level *level, int x, int y, int z, int data,
 	}
 	for (int i = 0; i < count; i++)
 	{
-		popResource(level, x, y, z, shared_ptr<ItemInstance>(new ItemInstance(Item::netherwart_seeds)));
+		popResource(level, x, y, z, std::make_shared<ItemInstance>(Item::netherwart_seeds));
 	}
 }