Make OsuConfigManager instances readonly
Make OsuConfigManager instances readonly

EVAST9919/osu,2yangk23/osu,smoogipoo/osu,peppy/osu,ppy/osu,2yangk23/osu,NeoAdonis/osu,NeoAdonis/osu,johnneijzen/osu,UselessToucan/osu,peppy/osu,NeoAdonis/osu,EVAST9919/osu,peppy/osu,smoogipoo/osu,smoogipooo/osu,UselessToucan/osu,UselessToucan/osu,smoogipoo/osu,ppy/osu,ppy/osu,peppy/osu-new,johnneijzen/osu