While there, kill "if (write_config())" constructs as this
really isn't a thing.

Not sure if this works, but it looks better than before.

This doesn't do anything in particular, because we don't know
what the input is without parsing it further.  It's not worse
than before in any case.  ;)

We don't need 7z anymore, so it's better to use the lightweight package.

(ipsec, "save password") change yes -> 1 for 28673. for https://github.com/opnsense/core/issues/1209

It's only partially true and will be compeltely wrong in
the mid-term future.  ;)

This reverts commit e0f9464e.

This crashes on FreeBSD 11 on boot, ouch...

This reverts commit 3eb11d16.

simple start, wrap anchor registration into plugin system, use miniupnpd as an example.

use registerAnchor() to register new anchors for pf into the main firewall script, we've hooked head/tail options and the different anchor types.
anchorToText() will extract the registered anchors back for the specified types and place in the script (head/tail) in text format for pf.

our new codebase was already hooked using legacy_bindings.inc, no additional includes needed to construct \OPNsense\Firewall\Plugin().