Fixed pet Snail not expiring properly (being removed from inventory when the time's up).
Broadcasted code update for most of the missing portal sound effects for portal scripts. It is expected for all scripted portals now to play the sound effect when traversing it.
Fixed issues with negative experience being distributed to characters
when killing a mob, rendering "Exp reset". Fixed chaos scroll behaving
oddly. Refactored debuff expirations to manage one list with registered
debuffs and expire times, thus lifting some load from the TimerManager.
Added concurrency protection on how World deals with parties. Thanks to
the DietStory dev team, fixed some issues with the MK maps.
