[MERGED PR] Random gang member selection at roundstart

[Kotlol]

I think hop and detective should be explicitly excluded from gang

HoP and Det as antags are already SUPER POWERFUL.
For conspirarors it's fine.
For gangs they give a gang a super unfair advantage.

So I agree with this.

Keep as solo antagonists. Not in team based ones like gangs. Conspirators is fine as they aren't as bad and the only antagonists per round.