pfSense

Fix PHP81 error in firewall_nat.inc

Fix carp_status.widget.php for PHP81. Fixes #13535

Fix syntax error in system_authservers.php. For #13533

Fix a PHP81 bug in system_authservers.php

Encode path+fn in browser.php. Fixes #13262

DHCP/v6 PHP8 error fixes for some cases.

If a config starts with only WAN, no LAN assigned, there are a number of
tags that were not handled properly on DHCP, DHCPv6, and RA.

Fixed up some other unrelated low-hanging fruit while I'm here, but all
of these files need a lot more work for PHP8.

Fix service status widget listing of non-disabled services

Add quotes around variable usage to prevent word splitting

Avoid using -o in test(1)

-1 is not allowed, exit only uses 0-255