If we don't fetch the info again, the frontpage will redirect us back to
/guestregister because the user does not have
registration_completed_date set.

If the user logs in through the frontpage we now check if they have
completed the registration process. If they have completed it halfway
before, we find their info through the GregUserProfile of the user and
redirect to the register page. If we dont find any profile connected to
the user they are treated as anonymous users as before.

Resolves: GREG-164

Resolves: GREG-173

If the user is neither a guest or a sponsor, generic text explaining
this is shown. If they are a guest, they are shown the data related to
them. If they are a sponsor, they are redirected to the /sponsor/ route.

Resolves: GREG-97

Issue: GREG-72

- Only clear info on 401
- Move the fetch to the provider.

Issue: GREG-72

- Better loading of translations using suspense.
- Adds a "fetched" variable to the user objects. Enable us to show a
  spinner before the return of the userinfo call

Issue: GREG-72

The UserContext is used to "protect" routes

Issue: GREG-70