pfSense

Add a helper function for unserialize(). Fix #15423

For calls to unserialize() which do not check for errors, use the
helper function instead.

Fix checkbox always being unchecked on page load

For the GUI option introduced in #15430

Automatically use floating states for IPsec rules. Fix #15430

Default to an empty array for functions expecting a countable value

Do this for foreach() and count().

Update all direct config access with accessor functions

Use config accessors in certificate functions

Use config accessors in users and groups functions

Correctly detect changed settings

Fix typos and copy/paste issues

Issues found by the PHP linter mostly include typos and usage of
unassigned variables. To address these, traverse the commit history
to determine the intent.

Kill states on gateway failover recovery. Implement #855