Did an overhaul to our <podcast:medium> handling so that "audio" and "video" podcasts are grouped together as just "podcasts".
So there are only 2 distinct groupings: Podcasts and Music.
I think this will be for the best. Video is still playable within the Podcasts grouping, but keeping them together will hopefully make sense intuitively, and reduce unnecessary fragmentation, and "choice paralysis".

