MUC etc. improvements (huge)

ConvoInformationDelegate got bold font tag. App supports newlines
properly in messages. Added Participant list model for participants
list. App gets roles for all the participants properly. Experimenting
with getting permissions from the server (working on it). Information
delegate got also a tag for date. Room name is being supported properly
(mostly). Working on adding icons to information delegate. App checks if
room is on MUC rooms list so it won't add it again when it's not needed.
Fixed some other issues with resetUnreadMessages(). Removed remaining
widget bits from XmppConnectivity.