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

Encode dir names in browser.php. Fixes #15525

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 traffic shaper functions

Use config accessors in certificate functions

Use config accessors in users and groups functions

Remove potential direct config references when displaying form rows

The first eval() change removes the reference and has no functional
effect given that $pkg_source_txt is not modified. While here, catch
any exceptions as well; before PHP 7, eval() would return false on...