Change power weapon spawns

Because of how frequently they spawn, its not unusual for multiple power weapons to be out and in the hands of players. Change the spawning of them so that if say the rocket launcher or sniper rifle is in play, a new one won’t spawn until the current one is out of ammo, has been dropped and has de-spawned. Its annoying how many power weapons can be in play at one time, especially on a map with multiple power weapons.