Use @iptv/playlist to generate M3U files in a typesafe way

[chrisbenincasa]

trafficstars

We recently converted our XMLTV generation over to use the @iptv/xmltv library which offers typesafe and fast xmltv generation. They also include a similar library for generating (and parsing) m3u files, https://github.com/ektotv/playlist. We can use this to build m3us without relying on the very gnarly string concatenation we are doing today.

[chrisbenincasa]

Ended up forking this because I had to make quite a few changes: https://github.com/chrisbenincasa/playlist