HTTP 401 should be used when logging in (i.e. authenticating) would make
a difference; HTTP 403 is reserved for requests that fail because the
already authenticated user is not authorized (i.e. lacking permissions)
to do something.
Event priorities are no longer in Laravel - see dbbfc62bef
Updated the AbstractPolicy terminology to reflect the new behaviour,
which is that there is no guarantee that the catch-all methods will run
after all specific methods have run globally. This behaviour is only
guaranteed within the policy.
They will probably be refactored away at a later stage (when we get
rid of the command bus). Until then, this lets us remove the
Flarum\Core namespace and actually feels quite clean.
