Add support for youtube-dl parameters

[rawlk]

Perhaps related to #19 , but I think the missing killer feature here is being able to save/use the YT-DL parameters. I struggled way too long only to realize that "format":"<>" was really just for the format that was desired, not just a way to pass in youtube-dl parameters.

It would be incredibly useful to add support for the other parameters, like the --output templating. Downloading part of an established youtube channel really needs this functionality in order to preserve the order and the channel names (and subtitles, video descriptions etc)

Thanks for sharing this, looking good so far!

[floviolleau]

Hi,

Yes! We miss this killer feature