Support m3u as backend/datasource

[WillinuX-Code]

The app can be used with an m3u list as backend instead of tvheadend. This will provide all features except recording and allows the usage as an alternative iptv app

[WillinuX-Code]

basic m3u parser implemented which can be reused when setup is done with m3u list

• next: Settings support for tvheadend config or m3u (non-tvheadend iptv) config