Guild hall PvP upgrade

Everyone who isn't a guildmate or ally will be attackable in a guild
hall. This is to allow hall owners to properly defend their hall.

No combat in a guild hall will turn anyone orange or red.

The guild hall scenario is one that is clearly for large groups and veterans.
There's really no need to couch this in all sorts of issues. It's a
major combat scenario and deserves to be treated as such.

* Everyone is attackable anywhere in a guild hall (allies and guildmates are still not attackable).

* Kills in halls don't turn you red.

* The switch does not require going outlaw (since everyone is attackable).

* Chest opens briefly when conquered.

* Unguildeds can now flip the switch, as such a restriction no longer makes sense.