Add back MIDI input handler for SDL2 window
Add back MIDI input handler for SDL2 window

ppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,ZLima12/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,ppy/osu-framework,ppy/osu-framework,ZLima12/osu-framework,peppy/osu-framework