Make consent requirement UI more flexible.
Review Request #9957 — Created May 17, 2018 and submitted
This change makes it so consent requirements can be a little more
flexible in their display. The majority of the change is plumbing that
allows a requirement to override the default text for the actions (Allow
or Block). This also makes it so that if the requirement doesn't specify
a data use description, we don't show that block.
Used in conjunction with a specialized requirement for asking users to