M3U support?

[jluttine]

Would it be possible to add support for M3U playlist format?

Currently, in the code it looks like it's supported (as some variable names contain m3u), but the output is actually xspf:

    case OUTPUT_VLC_M3U:
        info("output format vlc xspf playlist\n");

Here: https://github.com/stefantalpalaru/w_scan2/blob/master/src/scan.c#L4445

Motivation: I'm trying to get my live TV channels to Jellyfin. It supports M3U.

[stefantalpalaru]

Patches welcome.