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/spotify.rs

@@ -822,8 +822,8 @@ impl Spotify {
         self.api_with_retry(|api| api.user_playlist_follow_playlist(&owner_id, &id, true))
     }
 
-    pub fn artist_top_tracks(&self, id: String) -> Option<Vec<Track>> {
-        self.api_with_retry(|api| api.artist_top_tracks(&id, None))
+    pub fn artist_top_tracks(&self, id: &str) -> Option<Vec<Track>> {
+        self.api_with_retry(|api| api.artist_top_tracks(id, None))
             .map(|ft| ft.tracks.iter().map(|t| t.into()).collect())
     }