Guildhall Attack Check

Allow legal attack of anyone in GuildHall class rooms, provided the
victim is not in the attacker's guild or an allied guild. This solves
numerous safety issues that made hall combat awkward, often forcing
legitimate defenders to go outlaw or murderer to protect their hall.

This includes angeled characters, who cannot normally get into halls.
Allowing the attack of angeled characters should let us lift the Shadow
Rift restriction on halls.