Mixed rework / more mixed variants

[Polydanx]

Hi so I think it would be cool if we had more variations of the Mixed gamemodes, that were based on theme rather than the Mild and Action ones we have now; I’ll leave a few ideas below..

Mixed (Gothic)
Possible antags: Vampire, Werewolf, Wraith. A chaplains dream..

Mixed (Thievery)
Possible antags: Spy-thief, Salvager. Maybe a good way to introduce roundstart salvs to classic.

Mixed (Alien)
Possible antags: Changeling, Blob OR flock, Arcfiend. Hunter maybe?

Mixed (Syndicate)
Possible antags: Traitor, Spy-thief. 

I also thought the thematic mixes could have their own mid round events, good or bad: maybe regular holy water shipments on Gothic or gunbot spawns on Syndicate? Idk.. thoughts please