Added dummy handler for AAEE
Added Composing skill
Fixed skill canceling

Gotta remember to properly set ActiveSkill everywhere
Added Playing Instrument skill
Added skill callback functionality
Added stamina usage while Playing Instrument
Fixed stamina regen

Hunger multiplicator is only supposed to affect positive regen I guess.
Merge remote-tracking branch 'origin/master' into music
Added Song skill

Just to see how it works, we need knowledge about future skills as well.
Added perfect play option