Bunch of mask shit

Created by: Intigracy

Fixes the voice changer not working anymore. fixes #8805 (closed)

Adds can_flip = 0 to a bunch of masks that don't have up sprites but can currently flip. fixes #4085 (closed), since clowns/mimes shouldn't be taking off their masks anyway unless they're complete shitters.

Fixes unreported issue of scarves obj icon screwing up when you flip it up on mob. They had an _up icon_state for the onmob sprite, but not for the obj icon.