[Azoth MuC] Renamed PerformMucAction -> PerformAction.
[Azoth MuC] Check if entry is really IMUCEntry in GetParticipants().
[Azoth MuC] Handle non-conferences case.
[Azoth MuC] Return some commands for non-conferences.
[Azoth] Pass plain body to CreateCoreMessage() by value.
[Azoth] Moved rich body formatting here from MuC.
[Azoth] Pass empty plain body in commands replies.