public static void Shutdown()
{
EventManager.UnRegister <NpcIdleEvent>(OnCombatEvent);
EventManager.UnRegister <NpcWalkEvent>(OnCombatEvent);
EventManager.UnRegister <NpcSkillEvent>(OnCombatEvent);
EventManager.UnRegister <NpcDieEvent>(OnCombatEvent);
EventManager.UnRegister <NpcBackEvent>(OnCombatEvent);
WaveManager.Shutdown();
BuffManager.Shutdown();
SkillManager.Shutdown();
EmitterManager.Shutdown();
BulletManager.Shutdown();
NpcManager.Shutdown();
MapManager.Shutdown();
LabelManager.Shutdown();
SfxManager.Shutdown();
}