Asset Lifetime - Crowd Control and Entrance Rando

[leggettc18]

Kenix3
When crowd control is enabled, on scene load, load all the actor objects that crowd control will need. For each actor CC can spawn, if CC is enabled, do not run the actor unload function. On CC unload, we need check if any of the CC spawnable actors have <= 0 actors spawned for that type, then run unload if so.

Enemy randomizer will be treated the same as CC.

[Malkierian]

Once #4652 is merged, this should be very easy to address with a simple extra check against a list of objects and actors that CC needs so that they don't get unloaded if they happen to be in a scene's objects list.