- changed thumbnail size for audio to 1000x1000 at most
- .m4a and .aac now get thumbnail integrated into them
- ability to set custom thumbnail for audio
- changed audio caption
- enabling and disabling mods using config.json works now
- switched to yt-dlp (it supports YouTube without problems)
- added audio downloading
- changed 'mvd' mod tag to 'md'
- added filesize in qualities list
- changed thumbnail size 280x280 at most
- .webm and .mhtml extensions are ignored now
- fixed encoding errors in utils.get_md5 (they are ignored now, so not an actual fix, but it 100% won't break anythink)
