pfSense

Add some backend support for writing out a config so that the dhcp6 server can listen on the required MPD pppoe server interfaces.
Also nuke the failover entries, these don't exist for IPv6, this is handled by 2 servers and differing priorities

Add the PPPoE Server IP addresses to the locally configured addresses, this prevents the HTTP_REFERER check from triggering.

Removing gettext from strins that should not be translated

Put protection for session functions even here

Make the logic a bit more robust and readble

While here try to hint the user from _ENV['USER'] if no session info

Since php_sapi_name() is useless in pfSense test if argc has been registered or not to avoid warnings on bootup

Make sure the dhcp6c client always launches with the correct real interface argument.
Make sure we do a filter_configure_sync() here as otherwise the existing firewall rules (during boot) would block the dhcp6c client.

The ISC client was far worse then the WIDE client was, back to plan A
Revert "Merge changes required for using the ISC dhclient in pfSense with prefix delegation. This should hopefully be a bit more reliable in the long run."

This reverts commit 651018775c78e38045966825b920b641a0302b43....

Fix outbound NAT rules when interface is deleted:

- When delete interface, do not touch outbound NAT rules
- Skip outbound NAT rules when interface doesn't exist
- Bump latest_config to 9.2
- Since rules with no interface were considered as wan, convert old...