It's good to be back. :)
I think they should be in a separate directory (like...

It's good to be back. :)

I think they should be in a separate directory (like core) but I was hoping to discuss that elsewhere (see #2682289-7: Token ESLint error). We could do this here as well. In any case, I don't think it will be very easy to update as I had to change the default theme CSS that came with treetable (it was supposed to be a template anyway).

The treetable plugin is dual licensed MIT and GPL. I think that makes it possible to package?

+1 on the Javascript test. I am a little behind on efforts on PhantomJS in core. That could make this very easy.