#1441 MUC: Add room config option to disable IQ routing
Description of feature:
- Add a room config option to disable IQ routing to participants.
- IQ routing should be disabled by default.
- Announce the value of that setting in disco info, so clients can act before joining the MUC
In non-anon rooms IQ routing is not necessary at all, and in anon rooms it should be a edge edge edge case that a room creator wants to advertise a room as anon, while at the same time compromises the anonymity with routing IQ requests to the bare JID.