pfSense

Replace multilevel config array access around the web gui port

Replace multilevel config array accesses regarding openvpn

Replace multilevel array accesses regarding v4 and v6 gateways

Replace more problematic multilevel config array access

Fix text_to_compressed_ipv6() to omit %ifname from v6 addresses

Prior to this, v6 addresses would be considered by Net_IPv6::compress() to have
an ipv4 part consisting of all text from the address from the final colon
separator, and try to treat it as such. This is now problematic in php 8 as when...

Use config_path_enabled() and config_get_path() for troublesome paths

Add config_path_enabled() function and associated tests

Replace more direct config array access with config_get_path()

Change numerous direct references into config to config_get_path()

Correct dhcpv6 enable check to use config_get_path()