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/StructureRecipies.cpp

@@ -66,7 +66,7 @@ void StructureRecipies::addRecipes(Recipes *r)
 		L'#', Tile::cobblestone,
 		L'S');
 
-	r->addShapedRecipy(new ItemInstance((Tile*)Tile::chest), //
+	r->addShapedRecipy(new ItemInstance(static_cast<Tile *>(Tile::chest)), //
 		L"sssctg",
 		L"###", //
 		L"# #", //