add generic type to MessageType; we're assuming the socket payload has at least the correct structure.
add generic type to MessageType; we're assuming the socket payload has at least the correct structure.

notbakaneko/osu-web,ppy/osu-web,notbakaneko/osu-web,nanaya/osu-web,nanaya/osu-web,notbakaneko/osu-web,notbakaneko/osu-web,ppy/osu-web,ppy/osu-web,notbakaneko/osu-web,ppy/osu-web,ppy/osu-web,nanaya/osu-web,nanaya/osu-web,nanaya/osu-web