Add ability to export tasks

Support edit/update of dynamic data

This will allow for self filtering form based on options
Delegate form validation to Form instead of DynamicFormEntry

* Preserve external storage flag on field configuration
* User gridlayout to render task's forms
* Use new roles for task's nav

Credit: Jared Hancock <jared@osticket.com>

Fixup IE and firefox rendering issues

This begins with a layout manager for forms which will eventually be
designable via the UI for dynamic forms.

Reset permissions and change primary department and role

getVar() is now called first, then object properties and array properties
are considered, and then getTag() is considered if none of the other options
work. This allows for more predictable results using the variable
replacement system, and allows ::getVar() to override every other means to
use variables in email templates.