Spotify URL support for MPRIS OpenUri function (#314)

* Added OpenUri D-BUS MPRIS support.
Removed "user:" from URIType check because Spotify doesn't always provide it.

* Added tags to .gitignore

* Changed mpris metadata to actually return the track's url instead of the Spotify URI so that it matches the functionality of the official Spotify client.

* Changed mpris:trackid and xesam:url to not use static naming so it can support podcasts.

* Changed xesam:url to default to an empty string instead of "0"

* Added possibility to start playing Shows and Episodes via MPRIS.
Added possibility to search for Podcast Episodes.

* Fixed mpris:trackid not returning the id in the correct format.
MPRIS OpenUri function now supports Spotify url links.

* return result directly instead of mut string

* handle artist URLs/URIs

Co-authored-by: Henrik Friedrichsen <henrik@affekt.org>

src/ui/artist.rs

@@ -40,7 +40,7 @@ impl ArtistView {
             let library = library.clone();
             thread::spawn(move || {
                 if let Some(id) = id {
-                    if let Some(tracks) = spotify.artist_top_tracks(id) {
+                    if let Some(tracks) = spotify.artist_top_tracks(&id) {
                         top_tracks.write().unwrap().extend(tracks);
                         library.trigger_redraw();
                     }