(cherry picked from commit 0677991a)

This way, every time we touch our Menu.xml the page's breadcrumbs
are automatically switched.  :)

While there, clean the old $pgtitle setup so all of them translate
properly.  They are still used for the menu bar title, that will
require more effort to unfold.  Stay tuned.

@adschellevis if this is not the correct way to do it feel free
to refactor the MVC parts.

(cherry picked from commit 4788e561)
(cherry picked from commit ebe08f4c)

(cherry picked from commit e955045c)

(cherry picked from commit 0d2f56bd)

(cherry picked from commit dad9cf96)

(cherry picked from commit adfeac41)

(cherry picked from commit 28215751)

(cherry picked from commit 878eed3f)

(cherry picked from commit 50ae5409)

(cherry picked from commit 58ab1e61)
(cherry picked from commit e34dd6a6)

unbound could not be started via Status: Services.

(cherry picked from commit 38efc0c4)

(cherry picked from commit d75fc6b4)

(configd) template generation, return ERR when template not found. see https://github.com/opnsense/core/issues/329

(cherry picked from commit 196da2bb)

(cherry picked from commit 428591c1)

(cherry picked from commit c91ce8c9)

(cherry picked from commit 1adf60e0)

Starting to get a life of its own...

(cherry picked from commit 0d2272ff)

(cherry picked from commit 166c571b)

(legacy) quite obscure, return_gateways_array, but it's probably better to return an ip if we know the gateway...

(cherry picked from commit 6acd4980)

PR: https://github.com/opnsense/core/issues/451

This brings us down from 2.2 seconds to 0.2 seconds reload time
*without* the obscure caching in place.  This will likely solve
the filter reload issues that some people had.  :)

(cherry picked from commit 2c5d626c)

(cherry picked from commit ea880fb5)

(cherry picked from commit afad392e)

(cherry picked from commit 62c1853d)

(cherry picked from commit cc0864c1)

(cherry picked from commit 964786b3)

(cherry picked from commit 8fea4d96)

(cherry picked from commit b4ef16cb)

(cherry picked from commit a3474575)

(cherry picked from commit 4345a674)

(cherry picked from commit bdd2b263)

(cherry picked from commit 72cf2e19)

(cherry picked from commit 10a148ff)

(cherry picked from commit 77d87a27)

(cherry picked from commit a7c92a3d)

(cherry picked from commit fd40bd4f)

If unbound is enabled/disabled globally, the interface selectors should be
enabled/disabled as well.

(cherry picked from commit 12bc95c4)

(cherry picked from commit ff1c9001)

If IPv6 is not enabled in global networking settings, show the implicitly
generated IPv6 block rule in floating firewall rules.

(cherry picked from commit 7407fe8b)

I know I saw this while refactoring, but the changes seem to have been
lost.  This magic array stuffing for config[0] should be reduced, but
I don't want to du a config migration just for the sake of it.

(cherry picked from commit 4cad0067)