* Add Authorizable trait and interface to our user model so we have access to User::can/User::cant. We should take a look at where else our user model has diverged from Larvel since it was created...
* Policy cleanup/fixes.
This commit adds policies for the missing backend/"settings" areas. The
permissions were implemented a while back but the policies did not, so
authorizing actions was failing.
In addition, this condenses a lot of code in the policies into base
classes. Most of the files were identical except for table names, so we
move all of the checks into a base class and override the table name in
each policy.
* Use a better name and permission for the check in the default layout.
