This still passed the sprites instead of the actors. Moved the relinking code to DCoreActor::Destroy because it is the same for all games.
Also did a little bit of sound cleanup to ensure the sound backend does not hold stale actor pointers.
* the saveable tables were initialized too late when reading in the actors.
* the abort messages for the saveables did not show. We need to use I_FatalError here, plus some actor list modifications to make this work.
No GC yet, only the classes have been altered and some GC-related features been added.
Full switchover will require adding GC support to all data in the game.
