navigate away from the initial page twice to get somewhere. Remove some
of the cruft that was no longer used. Don't unconditionally redirect a
user to their homepage if another url was specified pre-login. This will
allow admins to create bookmarks to specific pfsense webui pages.
1) Redefine page privileges to not use static urls
2) Accurate generation of privilege definitions from source
3) Merging the user and group privileges into a single set
4) Allow any privilege to be added to users or groups w/ inheritance
5) Cleaning up the related WebUI pages
