Revert "Project modernization (#630)"

This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.

This reverts commit a9be52c41a.

Minecraft.World/Enemy.cpp

@@ -5,5 +5,5 @@ EntitySelector *Enemy::ENEMY_SELECTOR = new Enemy::EnemyEntitySelector();
 
 bool Enemy::EnemyEntitySelector::matches(shared_ptr<Entity> entity) const
 {
-	return (entity != nullptr) && entity->instanceof(eTYPE_ENEMY);
+	return (entity != NULL) && entity->instanceof(eTYPE_ENEMY);
 }