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.
This will return true if all slugs are not required (i.e., if `slug.required` is falsey). Is that intended?
```py
>>> all([])
True
```