Feature request: Sort by date added

[jhudis]

Spotify allows you to sort a playlist by the date each track was added to that playlist. It would be great if this was a feature of the Song Tagger GUI as well, since nearly all of my playlists are sorted this way on Spotify. That way, I could listen, in order, to new tracks I've added and tag them as I listen. (I know it's also possible to use Tagify or just drag tags onto the player built into the Song Tagger GUI, but I like the fact that the playlist viewer in the GUI lets you see all of the tags for each track since I can know at a glance what I've already tagged.) This shouldn't be too hard to implement, since you'd just need to request the added_at field from Spotify, create that field in your Track object, and add a column in the playlist viewer.