rename handlePlaylistSource & let accept grouplike

It's called loadPlaylistOrSource now, and can take a grouplike (which it
will process with processSmartPlaylist as usual) instead of a URL to
pass to a crawler.

This is so that all functionality for loading a playlist can be
collected in and accessed through one interface, so that modifications
to the way playlists are loaded will be reflected across everywhere that
loads a playlist.

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