Shuqi Dai

Fixing two small places.

changes on accompaniment module, together with the fixing to prefs path and constructor, missing prefs file bug.

Fix bug of missing commit function

Fix type error bug in allegro.srp

Modified prefs file path in prefs.srp and delay...

Fix bugs for importing midi files in Midi_player

Add behavior for ‘Delete project’ in Midi_playe...

Add behavior for 'New project’ in Midi_player F...