The platform information should be used to identify a platform
type, not the product name.  Not sure why pfSense came up with
this, but now it's so deeply tied into the system that we can't
just take it out.  The platform type is also steered by the
installer or build tools at the moment.  We will change that,
but it'll take more testing.

Discussed with: Jos

Avoids the regeneration of the keys on reboot.  I guess this is what
people would expect.  ;)

* Sane defaults like FreeBSD: off, no root login, no passwords.

* Fix a bug in <sshdkeyonly/> handling.  Yes, it has been broken for
  ages.

* Boot into the installer by default; it can still be aborted.

* Remove the dysfunct rescue installer.  The normal installer
  now has a better rescue tool called "Import configuration".

* Move and rework the installer launcher as rc.installer.  It
  can be called at any time if needed.

Instead of leaving the doors wide open, we make <disableconsolemenu/>
the default and bring back the killswitch for everbody who doesn't
like it.

We can dash out jails, use them for development or production
environments even.  Sure, they may not support some priviledged
operation, but keeping weird glue around that is probably not
in all the places it should be is weird.