Also try to unclog the use of requires and naming, we don't want
stuff like "dyndns/dyndns.class" so let's go back to the roots
and call the file phpdns.inc like the original prjoject was.

(gwlb.inc) ok, this looks odd, I can't find a valid use of "ipprotocol" in the gatewaygroups. (other then the one filter.inc)

(groups) align groupname length, like https://github.com/opnsense/core/commit/0829a34cef456c0065435405e965c45e8077d369

make csrf error page translateable, fix HTML errors in csrf.inc

Groups are only used as firewall rules interfaces, so move them
into the "pf" "plugin" and fix the menu accordingly.