Add track_format config option (#800)

* Added track_name_first config option to allow choosing if artists' names should be shown before or after the track name.

* Added active_fields config option, which allows configuration of which columns are visible in Queue/Library view.
This also removes the need for a separate track_name_first and album_column option.

* Fixed README

* Made custom tracklist formatting more flexible.
Updated readme with new instructions.
Reformatted impl member order to match the definitions in traits.rs.

* Added track_name_first config option to allow choosing if artists' names should be shown before or after the track name.

* Added active_fields config option, which allows configuration of which columns are visible in Queue/Library view.
This also removes the need for a separate track_name_first and album_column option.

* Fixed README

* Made custom tracklist formatting more flexible.
Updated readme with new instructions.
Reformatted impl member order to match the definitions in traits.rs.

* Fetch formatting config from library config

Instead of the lazy static mutex

* Moved custom format function to Playable impl as it's a better location to handle both Tracks and Episodes

* Rename from `tracklist_formatting` to `track_format`

Also shorten `format_{left|center|right}` to `{left|center|right}`

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

src/ui/listview.rs

@@ -108,7 +108,7 @@ impl<I: ListItem> ListView<I> {
             .iter()
             .enumerate()
             .filter(|(_, i)| {
-                i.display_left()
+                i.display_left(self.library.clone())
                     .to_lowercase()
                     .contains(&query[..].to_lowercase())
             })
@@ -189,7 +189,7 @@ impl<I: ListItem> View for ListView<I> {
                     ColorStyle::primary()
                 };
 
-                let left = item.display_left();
+                let left = item.display_left(self.library.clone());
                 let center = item.display_center(self.library.clone());
                 let right = item.display_right(self.library.clone());
                 let draw_center = !center.is_empty();