[suggestion] Add option to create .m3u files to list the CHD-disks per game

[agassi88]

Some emulators like RetroArch will show game duplicates as they recognize each CHD file for a multi-disk games as a separate games.

To solve this, we have to create .m3u files which list CHD disk images per game.
Examples:

https://www.reddit.com/r/RetroArch/comments/hwalg5/guide_combining_multiple_disc_on_chd_format/
https://gist.github.com/questionlp/1ea65e8ca86964b8269551d4c60fcb84

Could you please create a new flag for creating those m3u files?

Thanks for your work and attention.

[thingsiplay]

I'm actually familiar with this https://docs.libretro.com/guides/disc-swapping/#using-m3u-playlists and always had it in mind to support. I guess analyzing the filenames with "(Disc 1)" and so on could work. Right now I'm a bit busy with some other stuff, but will look into this when going back to tochd.