[Azoth] Expose ParentSource{Name,ID} AN fields.
[Azoth] Less verbose code in actions manager for AN rules creation.
[Azoth] Refactored status changing into HandleStatusChanged().
[Azoth] Slight code style changes.
[Azoth] Reworked status text making.
[Azoth] Set ParentSource{ID,Name} fields.
[Azoth] Clause for status change of MUC participants.
[Azoth] emphasize the names in status change notifications.
[Azoth] Support creating "notify when participant joins" rules.