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.