Split out frame stability calculation to own method
Split out frame stability calculation to own method

ppy/osu,NeoAdonis/osu,NeoAdonis/osu,peppy/osu,smoogipoo/osu,UselessToucan/osu,ppy/osu,NeoAdonis/osu,peppy/osu,ppy/osu,UselessToucan/osu,smoogipoo/osu,peppy/osu,smoogipoo/osu,smoogipooo/osu,UselessToucan/osu,peppy/osu-new