play monitoring improvement

[cj12312021]

This pull request updates the play monitoring code to detect video buffering and not count that towards the total play duration.

[cj12312021]

My latest push ensures that Track Activity is enabled by default.

[AdultSun]

Any chance this PR could also add tracking activity through DLNA? I don't know how difficult that would be.

#3681

[cj12312021]

DLNA doesn't use the front-end VideoJS player, so tracking activity there would likely not be done with the typescript code. So, the code would be completely separate from what we currently have. I have had it in mind to look into support on that side. I just need to spend some time understanding how playback works when using the DLNA service.

[AdultSun]

Thanks, I don't mean to pressure you if it's outside of the scope of your PR so no worries if you don't get to it. I just wanted to bring it up in case it was an easy add while you're working in this area.

[cj12312021]

No worries. I'm also interested in DLNA support, so you better believe I'd have a pull request out for the DLNA watch activity tracking once I've sorted out the details.

[WithoutPants]

My latest push ensures that Track Activity is enabled by default.

If this changes existing systems, this will require an accompanying release note.

[cj12312021]

The update should only affect new Stash configs. But I'll pull that change into a separate PR to avoid complicating the delivery of the play monitoring improvement.