Establish a clean and consistent way to eject a client from the game.

[tobz]

Notwithstanding actual errors, we need to make sure that linkdeath, etc, are all handled gracefully and correctly. This means a consistent way to boot a player and clean up their client accordingly. Right now we simply disconnect and remove the client if we encounter a processing error. What we need is to have a way to mark them for death, so to speak, and have them be cleaned up properly after the right amount of time.