Ytdl-sub

[FEATURE] YouTube playlists to fetch playlist uploader's poster + fanart (887)

Implements https://github.com/jmbannon/ytdl-sub/issues/756

TV Show presets whose URL is a playlist will try to get the playlist uploader's poster and fanart.

[BACKEND] Try to fetch source metadata from uploader_url (886)

Makes it possible to fix https://github.com/jmbannon/ytdl-sub/issues/756

In the case that uploader_url does not equal the input url, keep trying to fetch uploader_url to get all possible metadata that yt-dlp does not provide in a single API call

[FEATURE] Add `--dl-override` to pass dl arg overrides to all subscriptions (882)

With both `--match` and `--dl-override`, it is now possible to more easily experiment with subscriptions without needing to create a separate file.

For example, suppose you are changing some values in your subscription "Rick A" and want to test them out. You can now run:

ytdl-sub sub --dry-run --match Rick --dl-override '--ytdl-options.max_downloads 3'

This will
1. Dry-run
2. Only run for the subscription "Rick A"
3. Apply setting max_downloads to 3

[FEATURE] `--match` flag to only run subset of subscriptions (881)

Implements https://github.com/jmbannon/ytdl-sub/issues/880
and maybe fixes https://github.com/jmbannon/ytdl-sub/issues/827

Can now do `ytdl-sub sub --match SubA SubB` or `ytdl-sub sub --match SubA --match SubB`, which will only run subscriptions that contain `SubA` or `SubB` in their names

[BACKEND] String `split` scripting function (877)

[BACKEND] Optional default in `%array_at` scripting function (879)

As title