Add a music player to OGA

Add a music player to OGA

Currently it's cumbersome to browse and play though the music section. At a minimum, a radio player should allow users to have a listen, rate and 'favorite' tracks, and maybe edit playlists.

The benefit to users of OGA is that they'd be more likely to find music to use for their projects, and for the musicians, better exposure of their works and a way to get quick feedback (the ratings). This also might make OGA more entertaining to browse, and may encourage more community participation in the music and sound effect categories.