(cherry picked from commit 09b5bb08)

(cherry picked from commit 31a8d9e6)

(cherry picked from commit a0b554a9)

(cherry picked from commit 906f61bb)

(cherry picked from commit 0cc7e99e)

(cherry picked from commit 67415c33)

(cherry picked from commit d87ca5d2)

Also fix a race between includes: util.inc should come first.

(cherry picked from commit 95abbd78)

(cherry picked from commit ce2d7c10)

(php, suhosin) accept larger post input variables, needed to support new captiveportal file upload message

(cherry picked from commit 3ec8474d)

(cherry picked from commit 47ee5c58)

We try to avoid reading directly from config.xml as much as possible, because most applications use their own config type and we rather render our data to that format.

(cherry picked from commit ff72fe0d)

(cherry picked from commit d385237d)

(cherry picked from commit 1ec3078b)

(cherry picked from commit 0ef87027)

(cherry picked from commit 867b0600)

(cherry picked from commit 8455fef5)

(cherry picked from commit cb08c275)

(cherry picked from commit f22f4ad0)

(captiveportal, new) add cleansing of input templates to remove all non-changed data from the user provided template.

Next stepts to implement,
	make fetch_template aware of the user templates, so the frontend fetch will return the right content.
	deploy user provided template on service reload

(cherry picked from commit e978c501)

(cherry picked from commit 52d74d1b)

(cherry picked from commit 72e0a851)

(cherry picked from commit ab6d6d0d)

(cherry picked from commit beb4c5b8)

(cherry picked from commit 1812da68)

not fully sure if we should place them in service section, they maybe moved to settings later on.

(cherry picked from commit 0ee2e3cd)

(cherry picked from commit 842943e2)

(cherry picked from commit e8e37d0c)

(cherry picked from commit 0a890241)

(cherry picked from commit 395d0d20)

(cherry picked from commit d9d68b45)

(cherry picked from commit caf43295)

(cherry picked from commit 23b3fc5c)

(cherry picked from commit b35a1ac2)

(cherry picked from commit a9b57a31)

(cherry picked from commit 7ef601b2)

PR: https://forum.opnsense.org/index.php?topic=1490.0
(cherry picked from commit bc0fe3d4)

(cherry picked from commit 0714fb3b)