[MERGED PR] Makes specific antag garb acid immune(wizards excluded)

[Mouse]

There are some syndicate class helmet variants in the hat trait pool that can't be removed once put on.  If acidproofness is being added to those as well it might be a good idea to remove them from the hat trait pool so you don't get people who are totally immune to lings/vampires.

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May even be good to go further with it later and prevent the melting of stuff like cluwne gear or the staff of cthuhlu, though this may be out of scope for this particular PR.

Can't forget the horse mask?.