PR: https://forum.opnsense.org/index.php?topic=2517.0
(cherry picked from commit 877b317f)

(cherry picked from commit 2592fabb)

(cherry picked from commit a0f16501)

(cherry picked from commit c82fdd08)

(cherry picked from commit 38a5562c)

(legacy) remove javascript autoloading, all occurrences of it where replaced except the index/dashboard handling.

(cherry picked from commit 9bc93819)

(cherry picked from commit fc381754)

(cherry picked from commit ada16808)

(cherry picked from commit c43b7158)

(cherry picked from commit b5cd617e)

(cherry picked from commit fa81eb18)

(cherry picked from commit 998a5e01)

(cherry picked from commit b0779df9)

(cherry picked from commit 9338c2bf)

(cherry picked from commit 2a48e138)

(cherry picked from commit 17ffaa17)

(cherry picked from commit 6b2ec824)

(cherry picked from commit 35900425)

(cherry picked from commit 09173813)

(cherry picked from commit 3f780856)

(cherry picked from commit 0822b3dd)

(cherry picked from commit 7ce4776b)

(cherry picked from commit 632cfdff)

(cherry picked from commit 531e3036)

(cherry picked from commit 2cacc4b5)

(cherry picked from commit bec1cc37)

(cherry picked from commit 0ce22e12)

(cherry picked from commit 465c8ad4)
(cherry picked from commit c63366e5)

(cherry picked from commit bd7dfb22)

(cherry picked from commit 5c8ceeae)

(cherry picked from commit 9949d2a1)

Suggested by: @oparoz

(cherry picked from commit b41fc618)
(cherry picked from commit efb83c51)
(cherry picked from commit d74c2749)
(cherry picked from commit 6abb7dfa)
(cherry picked from commit 29ddac46)
(cherry picked from commit 7ec49ce3)

Spotted by: @fabianfrz

(cherry picked from commit ff6f2341)

Wouldn't it be better to do this unconditionally if more CSC
features are pushed and this might be missed again?

PR: https://forum.opnsense.org/index.php?topic=2449.0
(cherry picked from commit d68e86e8)

(cherry picked from commit 6e1be849)

(cherry picked from commit 6fd51494)