Auto load history for activecode problems on page load

[ascholerChemeketa]

Remove "Load History" button completely
Load historyscrubber on activecode problem initialization

[ascholerChemeketa]

Proposed changes for experiment with automatically loading history for activecode problems.

[bnmnetp]

This looks good except for in a timed exam. Yeah welcome to my world -- timed exams have always been problematic. In a timed exam we show the slider from the start. Now we are getting double sliders.

[bnmnetp]

The overview book has a couple of timed exams you can play with.

[bnmnetp]

I see ---

See the timedInit function in TimedActiveCodeMixin where I already have the call await this.addHistoryScrubber(true);

[bnmnetp]

No need for you to do anything... I just removed that call and everything looks good.

I don't think there is any reason to worry about awaiting it when we load the page and are initializing everything. I think I was just doing that for timed exams to be careful.

[bnmnetp]

OK, this will be live on Saturday. We will know a lot by Monday morning.