(cherry picked from commit 825338ee)

(cherry picked from commit 803d0a65)

(cherry picked from commit 92c4f14e)

(cherry picked from commit 0686ee0a)

(cherry picked from commit 5e3273eb)

(cherry picked from commit 7779d193)

(cherry picked from commit a741a9e2)

(cherry picked from commit 791ccd11)

(cherry picked from commit bcc6d757)

(cherry picked from commit f132a541)

(cherry picked from commit f33360dc)

(cherry picked from commit db188b0b)

(cherry picked from commit 6c9838a5)

(cherry picked from commit 3941c468)

(cherry picked from commit ce53d9d9)

(cherry picked from commit 9ff85b27)

(cherry picked from commit c3cccbc1)

(cherry picked from commit fb6c5408)

(cherry picked from commit 48e166d9)

(cherry picked from commit c7922913)

(cherry picked from commit ed83d1bf)

(cherry picked from commit 90d223ca)

o Adds a reinstall backend call
o Moves pkg_upgrade.sh into its own dir
o Don't clobber progress output when action is running
o Rename action to clearly reflect it's purpose
o Tweak EOL message a bit more

This is a test of how far we can go with our backend restructuring
without glitching firmware update temporarily.

(cherry picked from commit a5c4d51d)

(cherry picked from commit 8ee922f6)

FTP proxy via squid proxy server is available if needed.

(cherry picked from commit 54c22d2c)

(cherry picked from commit 06b0207e)

(cherry picked from commit df86acd7)

(cherry picked from commit 5700e210)

o Deduplicate inside guiconfig.inc, one word needs to be changed...
o No spurious functions unless needed, it will likely linger forever.
o Be less specific about what the function will do, it may change.
o Remove "dismissable", there's no use dismissing static alerts.
o Zap filter switch case, firewall is used in the GUI anyway.
o Mop up the manual instances of the early pull request still present.
o Transform gettext(html) into sprintf(gettext, html).

(cherry picked from commit 32b572c9)

Added a link to the "disabled service" banner of the firewall service, to
enable the firewall.

(cherry picked from commit ba1c4879)

(cherry picked from commit 0a7e8655)

If firewall is globally disabled, show a warning banner in all relevant
firewall configuration and diagnostic screens (filter and NAT).

(cherry picked from commit 5d159b2c)

(cherry picked from commit 832b8011)

(legacy) fix PHP Strict Standards:  Only variables should be passed by reference in /usr/local/etc/inc/util.inc on line 861

(cherry picked from commit cd381db4)

(cherry picked from commit d0ee041e)

(legacy) add legacy_interface_details to interfaces.lib.inc, first step in replacing pfSense_get_interface_addresses

(cherry picked from commit 4a2cb5fa)

(cherry picked from commit 08913f70)

(cherry picked from commit c64b6dbd)

(cherry picked from commit 26184e18)

(cherry picked from commit 01faad8f)