Podcast support improvements. (#229)

* 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.

src/show.rs

@@ -5,7 +5,7 @@ use crate::queue::Queue;
 use crate::spotify::Spotify;
 use crate::traits::{IntoBoxedViewExt, ListItem, ViewExt};
 use crate::ui::show::ShowView;
-use rspotify::model::show::SimplifiedShow;
+use rspotify::model::show::{SimplifiedShow, FullShow};
 use std::fmt;
 use std::sync::Arc;
 
@@ -63,6 +63,20 @@ impl From<&SimplifiedShow> for Show {
     }
 }
 
+impl From<&FullShow> for Show {
+    fn from(show: &FullShow) -> Self {
+        Self {
+            id: show.id.clone(),
+            uri: show.uri.clone(),
+            name: show.name.clone(),
+            publisher: show.publisher.clone(),
+            description: show.description.clone(),
+            cover_url: show.images.get(0).map(|i| i.url.clone()),
+            episodes: None,
+        }
+    }
+}
+
 impl fmt::Display for Show {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{} - {}", self.publisher, self.name)