Cover arts for spotify integration

[xemle]

Recently libspotify server spop got a new command to retrieve track and album covers from spotify (uimage command: https://github.com/Schnouki/spop/commit/f275c4237e652b24c69888196bfc8819cd003a35). It would be awesome if the spotify integration of volumio's web UI uses this functionality and shows the cover instead of the spotify icon.

Or will this feature request break the minimal UI of volumio?

[xemle]

For people who mainly listen to Spotify through the awesome Volumio distro (like me): I've created an alternative Spotify player based on spop: spop-web. spop-web is mobile friendly, comes with great search and browsing feature and uses cover art.