PR: https://forum.opnsense.org/index.php?topic=3137.0
(cherry picked from commit acbd63db)

(cherry picked from commit 93de08bd)

Spotted by: @fabianfrz

(cherry picked from commit 3953f4fc)

(cherry picked from commit 50c1d95a)
(cherry picked from commit 82e674f7)
(cherry picked from commit 0e792483)
(cherry picked from commit 123e68c3)

(interfaces/dhcpv6 client) add debug option to advanced dhcpv6 client config, closes https://github.com/opnsense/core/issues/859

(cherry picked from commit 91756d81)

(cherry picked from commit 7077a7c7)
(cherry picked from commit cd3a1b3e)
(cherry picked from commit 5faaa75a)
(cherry picked from commit ef34f1a2)
(cherry picked from commit 9f6112a5)
(cherry picked from commit 95cb2f9d)
(cherry picked from commit 8d10efac)

Requires fiddling with /etc/fstab, at least that is a file
that we never touch.  It's harder for installs that need
TRIM to be off all the time as the first boot does actually
enable it.  That means after the install is complete it needs
to be CTRL+C'ed and the fstab entry modified before reboot.

PR: https://forum.opnsense.org/index.php?topic=3044
(cherry picked from commit 68d539af)

system_staticroutes_configure, remove dead code, add rc.newroutedns dependencies and make the optional alias use in static routes explicit with a typeahead

(cherry picked from commit 542480f1)

(cherry picked from commit de5a42e0)

If one deletes "plugins.inc", this way the plugin system can be
disabled.  That's a lot better than removing plugins.inc.d/
content and executing the stubs everytime anyway.

(cherry picked from commit 8371e3b9)
(cherry picked from commit 87066bbe)
(cherry picked from commit 4cb9fe70)

As before, make this a mandatory feature for dhcp chroot in order
to catch problems with the implemenation as early as possible.

(cherry picked from commit 40cfb0da)

Add a test case where it hurts: syslog startup.  :)

(cherry picked from commit ffc17035)

(cherry picked from commit 23abe72a)

(captive portal) add option "drop expired vouchers", closes https://github.com/opnsense/core/issues/977

(cherry picked from commit 85c2b81b)
(cherry picked from commit 38b31f5d)
(cherry picked from commit 74c6a36c)

(cherry picked from commit 29883226)

(cherry picked from commit cf41a413)

(cherry picked from commit 0fcf6157)

(cherry picked from commit f3b34837)

(cherry picked from commit 75eec3cf)

for example, return all active non virtual interfaces:

$interfaces = legacy_config_get_interfaces(array("virtual" => false, "enable" => true));

(cherry picked from commit 2fd3a68d)

While this is a neat milestone, it becomes apparent how convuluted
the code path and interface info polling is.  Looking at it, the
whole interface layer can probably make performance jumps to at least
twice the read or reconfigure speed...

(cherry picked from commit 3f8c0fea)

(cherry picked from commit 734c7f45)

(cherry picked from commit cf274fef)

(cherry picked from commit 9b94d2f2)
(cherry picked from commit 3272c7bb)

Most of this work was done by @adschellevis.  :)

o Movable widgets
o Mini-API for widgets
o Interfaces menu code reduction
o SVG traffic graphs replaced
o CSRF tightening

(cherry picked from commit 0652bd06)

(cherry picked from commit 8028daee)

(cherry picked from commit 0ddccb7c)

(cherry picked from commit e74f0c2a)
(cherry picked from commit 89ea14d2)

(cherry picked from commit e0bbb0c6)
(cherry picked from commit e053ebc2)
(cherry picked from commit feaf21fc)
(cherry picked from commit bdcdd8b1)

(dnsmasq) add custom port option for domain overrides, closes https://github.com/opnsense/core/issues/799

(cherry picked from commit 36710dce)

(cherry picked from commit f57c0f04)

Kindly pointed out by a generous tester.  Thank you.

(cherry picked from commit 0ce997d0)
(cherry picked from commit 29153230)

(cherry picked from commit 714729af)
(cherry picked from commit 01c41cdc)

(cherry picked from commit ed5c0dde)
(cherry picked from commit b3d14817)
(cherry picked from commit b4329c84)
(cherry picked from commit 294c3801)