fix logic error in the behaviour of fixup_default_gateway()

(cherry picked from commit 532ee5bc)

This reverts commit c4628a0b.
It looks like pkg can't handle php70 to php71 at all.

(cherry picked from commit da68e436)

(cherry picked from commit c4628a0b)

(cherry picked from commit 3e527d8f)

(cherry picked from commit d0d52b08)

(cherry picked from commit 6d8812c8)

(cherry picked from commit 203ba240)

(cherry picked from commit f039e921)
(cherry picked from commit 85279119)

firewall_rules, keep category selection when changing tabs. closes https://github.com/opnsense/core/issues/1592

(cherry picked from commit e660269e)
(cherry picked from commit d5ceec2a)

(cherry picked from commit b16ea822)

(cherry picked from commit 965b6eba)

(cherry picked from commit 8a0e3bc7)
(cherry picked from commit 5f1f9cae)

(cherry picked from commit fe571ac4)
(cherry picked from commit c998907e)

(cherry picked from commit 9398670a)

(cherry picked from commit a7825a60)

(cherry picked from commit 7e8c0957)

(cherry picked from commit 51b6f4df)

(cherry picked from commit dcbbcf89)

(cherry picked from commit 27a92e91)
(cherry picked from commit 0d70a9c9)

(cherry picked from commit 3226dce2)

(cherry picked from commit da313a94)
(cherry picked from commit f2f3b0c0)

(cherry picked from commit c9b7cdfe)
(cherry picked from commit a298341d)
(cherry picked from commit f826593e)
(cherry picked from commit 6223e0b5)
(cherry picked from commit a57d0e88)

(cherry picked from commit 5eb2c986)

(cherry picked from commit 84a99758)

(cherry picked from commit 761ccab2)

(cherry picked from commit 12810d94)
(cherry picked from commit bb80ad02)

(cherry picked from commit 335b591d)
(cherry picked from commit a7134a01)

PR: https://forum.opnsense.org/index.php?topic=5213.0

(cherry picked from commit ed66e872)
(cherry picked from commit 93d68f77)

filter/port alias, allow ranges in the form of 80-100, replace with 80:100. closes https://github.com/opnsense/core/issues/1529

(cherry picked from commit 254775d4)

If a field isn't required and the user sets it with a faulty value, it would pass because it didn't know it wasn't set before user input.
There where two issues, first one, not knowing it was in init state (solved with internalFieldLoaded), next all field types should have used actionPostLoadingEvent to customize loading behaviour.

(cherry picked from commit 091b0754)