User configurable reports

the plan is to pilot/QA on this on prod so I'm putting it out for code review now. I'm guessing it's easiest to review as a whole, though the commits should represent ~atomic actions.

I think it's good to merge whenever code review passes.
I think we decided to just leave it as `self.config` and they you can pull out whatever params you need manually rather than making them properties on the class.