pfSense

Fixed #5193 clean up user prompts

Introduce read_global_var:

- Add a new script, read_global_var, that returns the value of any item
contained in global array $g
- Replace all grep and sed magic from shell scripts

Preparation #5159 (Javascript refactoring)
javascript/pfSenseHelpers.js created and populated with common hide/show/disable/enable functions
file included via foot.inc
Those functions removed from firewall_nat_edit.php to test

Improved styling of page title prevents spurious underline

Page title now hyperlink to page

Fixed 5225

Fixed 5225
Programmer had mangled element name in if($_POST) section

Introduce read_xml_tag.sh

Create /usr/local/sbin/read_xml_tag.sh, that will read a xml tag from
config file using xmllint. Replace all direct read using cat, grep, sed,
... by this script

Fix #5220, setup PHP timezone:

- Get defined zoneinfo in the following order:
- /var/db/zoneinfo
- /cf/conf/config.xml
- /etc/inc/globals_override.inc
- /etc/inc/globals.inc

Only need to check 'vip' here.