[MERGED PR] Disables antag captains on classic

[Oremir]

I like the idea some people put forward of the Captain instead only being eligable for Sleepers/Conspirators or other T modes that don't put extra powers/equipement in their hands. Seems like a reasonable comprimise. I will say i'm not really that familiar of how much of a problem this all really is on 1 so ultimately i'm fairly neutral on the decission in general.