[Azoth Xoox] Check if the tune has been changed before emitting.
[Azoth] Added IHaveContactMood.
[Azoth] Connect to tuneChanged() only for IHaveContactTune.
[Azoth Xoox] Implement IHaveContactMood.
[Azoth] Use IHaveContactMood instead of "user_mood".
[Azoth] Don't skip variant tooltip building if info is empty.