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/ThornsEnchantment.cpp

@@ -62,14 +62,14 @@ void ThornsEnchantment::doThornsAfterAttack(shared_ptr<Entity> source, shared_pt
 		source->hurt(DamageSource::thorns(target), getDamage(level, random));
 		source->playSound(eSoundType_DAMAGE_THORNS, .5f, 1.0f);
 
-		if (item != NULL)
+		if (item != nullptr)
 		{
 			item->hurtAndBreak(3, target);
 		}
 	}
 	else
 	{
-		if (item != NULL)
+		if (item != nullptr)
 		{
 			item->hurtAndBreak(1, target);
 		}