- Rewrite FilmOnHLS{,Worker}
  - Override fetching logic of HLSStreamWorker._fetch_playlist
  - Rewrite playlist URL refresh logic and move everything to the
    FilmOnHLSStream.url property
- Clean up FilmOnAPI and schemas
- Clean up FilmOn plugin class
  - Move http adapter definitions to constructor
  - Set hls-playlist-reload-time to "segment"
  - Clean up _get_streams
- Fix tests

- Rewrite FilmOnHLS{,Worker}
  - Override fetching logic of HLSStreamWorker._fetch_playlist
  - Rewrite playlist URL refresh logic and move everything to the
    FilmOnHLSStream.url property
- Clean up FilmOnAPI and schemas
- Clean up FilmOn plugin class
  - Move http adapter definitions to constructor
  - Set hls-playlist-reload-time to "segment"
  - Clean up _get_streams
- Fix tests