pfSense

Provide compare_pkg_versions

This function parses and compares two strings to see which one seems to represent the greater "version". It splits the strings into pieces that are digits and pieces that are anything else. e.g.
"utility-24.9_5 pkg v4.5"
becomes...

only read file if it exists, and only foreach if an array.

Allow to create empty bogons on nanoBSD

If for some reason the bogons file/s do not exist then this code creates
empty ones before making any use of them in the rule set.
On nanoBSD this can fail if the file system is mount RO.
Protect against this possibility by use conf_mount_rw and conf_mount_ro

This is handled above now.

More safety belts on CP DB open

Take more care when attempting to open the CP database. Don't assume it's valid before attempting to use it.

Reinitialize the captive portal database for a zone if it is corrupt/unreadable. Fixes #4904

remove the destination server's interface(s) from dhcrelay. Ticket #4908

remove more old, unused platform stuff

Fix killing of individual states for IPv6. Ticket #4906