Keep first

[DanteFlame]

An inversion on the clean up feature so that rather than keeping only the X most recent episodes to be published, keep the files for only the X oldest episodes in the feed.

Use case being a user made backlog playlist of a 200 videos, that you want to make your way through removing old videos from the list as you go.

You want to have the first 10 or so episodes on your phone at a time but still be able to see the runway of episodes ahead of you. You make your way through 5 of them, remove those 5 from your YouTube playlist, podsync registers the change and downloads the next 5 like a rolling buffer until the playlist is finished.