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/ToolRecipies.cpp

@@ -103,7 +103,7 @@ void ToolRecipies::addRecipes(Recipes *r)
 			}
 		}
 	}
-	r->addShapedRecipy(new ItemInstance((Item *)Item::shears), 
+	r->addShapedRecipy(new ItemInstance(static_cast<Item *>(Item::shears)), 
 		L"sscig",
         L" #", //
         L"# ", //