PR: https://forum.opnsense.org/index.php?topic=1529.0

todo: remove rest of auth funcions with overlapping functionality in auth.inc

crashreport,   ldap_set_option(): supplied argument is not a valid ldap link resource in /usr/local/opnsense/mvc/app/library/OPNsense/Auth/LDAP.php on line 213

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

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

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.