(cherry picked from commit 9a22c04f)

(cherry picked from commit 7968b548)

(cherry picked from commit 97b56090)

(cherry picked from commit f9129538)

(cherry picked from commit 5a317b09)

This roughly equals to:

o Reworks of routing, gateways and settings pages
o Menu restructuring and tab removal
o Layout and padding improvements
o Log file viewer improvements

(cherry picked from commit 7f7fde41)

(cherry picked from commit ef486094)

(cherry picked from commit 192b6eb6)

(cherry picked from commit 4370f811)

(cherry picked from commit 7f1c91f7)

(cherry picked from commit 6dcbac7a)

(cherry picked from commit a4cd1e46)
(cherry picked from commit 4a618919)

(cherry picked from commit 14d3ba6e)

(cherry picked from commit 523a4711)

(legacy) crashreport strpos() expects parameter 1 to be string, array given in /usr/local/www/firewall_rules_edit.php on line 747

(cherry picked from commit 84ba6a49)

Spotted by: @fabianfrz

(cherry picked from commit 8ac115c9)

(cherry picked from commit c6ff30e4)

o Page did not work with translations.
o Selected serial device wasn't shown.
o Very old gpsport migration code zapped.
o set_gps_default() must trigger on load.

(cherry picked from commit bb55f6c0)

(cherry picked from commit f1c28948)

(cherry picked from commit 48acede9)

(cherry picked from commit 1d43bced)

(cherry picked from commit 09f9ace8)

(cherry picked from commit ddc987e2)

(cherry picked from commit 2daf0e20)

(cherry picked from commit 7413cd78)

(cherry picked from commit 3ba6fecf)

(cherry picked from commit 1c2ea230)

(cherry picked from commit e2b1f644)

everywhere, anytime, just for fun...  first of many :(

(cherry picked from commit 3df63a5d)

Mostly merge from master plus a few more that were still in the
stable/15.7 code base.

(cherry picked from commit 343aa7df)
(cherry picked from commit 692a8f77)
(cherry picked from commit f8b281e9)
(cherry picked from commit 8d2e334b)
(cherry picked from commit b9346703)
(cherry picked from commit 418b13af)
(cherry picked from commit b235235d)
(cherry picked from commit e259289f)
(cherry picked from commit 68fed4c9)
(cherry picked from commit 8757d000)
(cherry picked from commit 33394bdc)
(cherry picked from commit 8cccf2e8)
(cherry picked from commit eb29c782)
(cherry picked from commit 3fcda571)
(cherry picked from commit 4ff0b327)

(cherry picked from commit b980171c)

https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_server.php#L1175
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_server.php#L1178 bis 1182
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export_shared.php#L175
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export_shared.php#L191
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export_shared.php#L206
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export_shared.php#L210
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export_shared.php#L214
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L340
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L369
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L373
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L387
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L402
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L406
https://github.com/opnsense/core/blob/master/src/www/vpn_openvpn_export.php#L410
(cherry picked from commit 094ad4e8)

(cherry picked from commit 7b7e6150)

(cherry picked from commit f9451641)

(cherry picked from commit 608dbd9a)

(cherry picked from commit 71f7dbc3)

(cherry picked from commit 235169e2)

(cherry picked from commit 5cf5ef0c)