* Move verification to a shared package
The verifier is constructed at HTTP request time and added to the
context. It can then be called from appropriate handlers with
standardized error handling after all the routing.
I intentionally did not add to the handlers yet as I am a good distance
into the scope updates and didn't want to cause even more merge
conflicts. So at the moment authz is again disabled, but once the scope
updates are done, this will be integrated back in.