Support embedded and external subtitles

Hi!

I'd would just like to mention that it would be nice if this plugin could show embedded subtitles, and external ones. It would be useful sometimes. For example I can download music/podcasts (or other audio centric videos) with subtitles (lyrics) from youtube via yt-dlp. It can embed subtitles into videofiles, or alternatively it can create it as an external file (including the lrc format in this case). Chapters, are conveniently already supported by foobar.

But I only could get it to view with this plugin if I place it in the proper folder in the proper format and naming convention manually.

I'll be honest this is unlikely to happen any time soon (if at all) but I'll leave the issue here in case others want it or I'm feeling inspired at some point.