Add ability to export tasks

* 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 will allow the typeahead to wait a short amount of time before fetching
results from the backend, which will allow for request debouncing per se. In
other words, not every keystroke will signal a request to the backend to
update the results. Instead, when the user slows down typing, the request
will begin thereafter.

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

orm: Correctly label correlated query joins via sub-queries
orm: Fixup formatting of dates in queries
orm: Fixup mangling of parameter values with colons in sub-queries
misc: Fixup incorrect offset calculation in Misc::dbtime()
forms: search: Add ability to describe a field search
search: Fix crash searching by ticket due date
search: Fix wrong results if searching by a date field (unix epoch was not
    converted to MySQL date format)
search: Fix wrong results searching by date == or !=

Fixes #2143

This adds the concept of independent multi-thread rendering

Credit: Jared

This is required with the connection to Dept::getEmail()->send(...)