Move formats into their own files

[Cook-I-T]

This PR moves the argument of the --format parameter into their own text file, which makes the yt-dlp command way smaller and therefore more readable and eases maintenence as its now collected in one place. Additionally it allows for adding newlines and comments (by beginning a line with #) to the format files, easing the overview over them.

Documentation would still need to be updated, I wanted to wait with that until I get a response here if this has a chance of getting accepted.