Turns out trying to not resume in-progress Scrobbles is super painful.
Maybe I'll come up with a better idea later, but for now, I'd rather
just resurrect old paused scrobbles of past tracks, rather than
completely mess up all other aspects of scrobbling.
If you send Track data from the Jellyfin Webhook plugin, we'll do the
right thing with it. Lots more to do to clean this up, but it also
involved moduralizing the code for scrobbling so it's a little simpler
to understand what's going on.
