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/ThrownEgg.cpp

@@ -33,7 +33,7 @@ ThrownEgg::ThrownEgg(Level *level, double x, double y, double z) : Throwable(lev
 
 void ThrownEgg::onHit(HitResult *res)
 {
-	if (res->entity != NULL)
+	if (res->entity != nullptr)
 	{
 		DamageSource *damageSource = DamageSource::thrown(shared_from_this(), owner);
 		res->entity->hurt(damageSource, 0);
@@ -47,7 +47,7 @@ void ThrownEgg::onHit(HitResult *res)
 			if (random->nextInt(32) == 0) count = 4;
 			for (int i = 0; i < count; i++)
 			{
-				shared_ptr<Chicken> chicken = shared_ptr<Chicken>( new Chicken(level) );
+				shared_ptr<Chicken> chicken = std::make_shared<Chicken>(level);
 				chicken->setAge(-20 * 60 * 20);
 
 				chicken->moveTo(x, y, z, yRot, 0);