WIP: Add Jellyfin support

[shekhirin]

Closes #442

The API itself is very similar to Emby, with minor changes to ApiClient.

TODO:

• When the subtitle selection dialog is opened before subtitles are loaded, entries will have a spinner until you re-open the dialog
• Auto-pause works, but auto-play doesn't. Video element detection seems to work (because pause works), but hover event listener does not.
• Subtitles are hovering on top of media progress and controls bar
• Jellyfin pages.json entry shouldn't conflict with Emby, because hash is different, but I didn't test it.
• I did a hacky timeout with five retries to fetch the subtitles, but I'm not sure if that's the best way to do it. I see that netflix-page.ts has the same approach.

Other than that, it works pretty well 🙂

[killergerbah]

Thanks for your work! Just some general comments on the TODOs you listed:

When the subtitle selection dialog is opened before subtitles are loaded, entries will have a spinner until you re-open the dialog

This is a problem in general with the subtitle track selector dialog. Not necessary to fix with the functionality you're adding but definitely a welcome fix it you'd like to attempt it.

Auto-pause works, but auto-play doesn't. Video element detection seems to work (because pause works), but hover event listener does not.

Auto-play works by detecting hover on top of the video element, in order to deal with the case where users are mousing inside a popup dictionary like Yomitan (don't want to auto-play in that case). So I suspect there is something about Jellyfin making the video hover detection not work.

Subtitles are hovering on top of media progress and controls bar

This is a side effect of how subtitles are rendered in general in order to keep the subtitles text selectable and I don't think it's necessary to fix. Users have the option to adjust the position of the subtitles.

[bpwhelan]

@shekhirin Hey, would you consider this still WIP? I added Emby support to asbplayer and all the things you listed are "technically" issues in Emby too.

@killergerbah may have a different opinion though.

[shekhirin]

@shekhirin Hey, would you consider this still WIP? I added Emby support to asbplayer and all the things you listed are "technically" issues in Emby too.

I see, then it's ready for review 😄 I've been using this for the past weeks and it's been good so far.

[killergerbah]

Thanks!