* in PlayerDetailed
	* added media url
	* external media panel is shown only when not playing
	* when changing audio stream in the panel, clears the media from cache first
* both url in EpisodeInfo and PlayerDetailed are long-clickable for sharing
* in PlayerUI, fast rewind icon is changed to skipback and rewind icon (long-click rewinds to beginning)
* adjusted Feed scoring algorithm a bit: partially played media does not penalize if the media is given a higher rating than OK
