* Allow locally muting channel participants
* Allow setting subject on messages
* Subject-only message sets thread subject/topic/name
* Display list of recent threads
* Support full channel configuration form for owners
* Register with channel when joining, deregister when leaving (where supported)
* Fix sending files again from Cheogram's own downloaded files
* Process channel password if present in XMPP URI
* Expert setting to choose voice message codec
* Visual Tweaks
