A follow-up to the prior commit which fixes some bugs in the 'beautiful subscriptions' implementation. A proper migration guide will be written in the wiki once it's ready
Makes setting yt-dlp's `format` field easier by giving it its own documented plugin.
Old:
```
my_format_preset:
ytdl_options:
format: "best"
```
New:
```
my_format_preset:
format: "best"
```
The old method will still work, so do not worry about updating configs ASAP. However, the option is available to save a few lines 😉
