Right-click on the album art in the lock screen music panel to set it
as the desktop wallpaper. Right-click again or click anywhere on the
background to restore the original wallpaper. Wallpaper also restores
automatically on track change or screen unlock.
Uses direct plist manipulation of the wallpaper config to avoid leaving
traces in the wallpaper picker. Album art PNG is pre-cached in the
background on track change for instant application.
Adds video artwork URL fetching from iTunes catalog for Apple Music
tracks (musicVideo entity search).
Signed-off-by: Jis G Jacob <studiokeys@blissroms.org>
