Transcoding Support

[seang96]

This is a PR with the changes from #266 merged with latest code after the rework.

From testing, the only issues I have encountered so far are:

1. audio tracks options do not load, default is the only one that can be selected
2. Website says it is direct playing, but it does transcode, I don't think the original PR is sending all of the correct API requests to make Jellyfin say it is being transcoded. I believe if we se t that maximum bit rate to a low value it may fix this, but I think we'd need to set predefined bitrates per resolution?
3. No option to change transcoding in the player

[peerless2012]

This feature is useful, will update this pull request?

[nomadics9]

jellyfinApi.api.dynamicHlsApi.getVariantHlsVideoPlaylistUrl()

doesnt work. playback shows nothing

jellyfinApi.videosApi.getVideoStreamUrl()

works with transcoding but playback is unseekable and shows as livestream rather than the full playback with the full media time.

idk why and i dont know how to fix it :(