void CleanupLevel()
{
if (null != Projectiles)
{
Projectiles.DestroyAll();
Projectiles = null;
}
if (null != Turrets)
{
Turrets.DestroyAll();
Turrets = null;
}
if (null != Waves)
{
Waves.DestroyAll();
Waves = null;
}
GameObjectFactory.Cleanup();
LevelDesc = null;
}