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/PickaxeItem.cpp

@@ -54,7 +54,7 @@ bool PickaxeItem::canDestroySpecial(Tile *tile)
 // 4J - brought forward from 1.2.3
 float PickaxeItem::getDestroySpeed(shared_ptr<ItemInstance> itemInstance, Tile *tile)
 {
-	if (tile != NULL && (tile->material == Material::metal || tile->material == Material::heavyMetal || tile->material == Material::stone))
+	if (tile != nullptr && (tile->material == Material::metal || tile->material == Material::heavyMetal || tile->material == Material::stone))
 	{
 		return speed;
 	}