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/AnvilTile.cpp

@@ -21,7 +21,7 @@ AnvilTile::AnvilTile(int id) : HeavyTile(id, Material::heavyMetal, isSolidRender
 {
 	part = PART_BASE;
 	setLightBlock(0);
-	icons = NULL;
+	icons = nullptr;
 }
 
 bool AnvilTile::isCubeShaped()