Export custom fields with the ticket queue export

Reviewed-By: Peter Rotich <peter@osticket.com>

Collaborators

Reviewed-By: Jared Hancock <jared@osticket.com>

Provide facility to set collaborator status on add.

Reviewed-By: Jared Hancock <jared@osticket.com>

Also add in the user email address after the user name.

This patch also adds an ::export() method to the FormField() class which
allows a field to define how the data should be formatted when exported.

Fixes #390

For use in the materialized view column names

Fix possible serious errors in dynamic form fields

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix ticket queue counts for limited users

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix dropping of materialized view when variable name is changed

Ensure view exists before merging updates

Prevent possible sql injection error in field name used in the materialized
view.

Prevent possible xss error in the display of the field label and variable
name in the admin panel.

Conflicts:
	include/class.ticket.php

Ensure form for fields created during install

Reviewed-By: Peter Rotich <peter@osticket.com>

Conflicts:
	include/class.http.php
	include/mysqli.php

email: (Almost) always convert html on text body

Reviewed-By: Peter Rotich <peter@osticket.com>

Don't send attachments in staff alerts

Reviewed-By: Peter Rotich <peter@osticket.com>

Add underline button to redactor toolbars

Reviewed-By: Peter Rotich <peter@osticket.com>

This is especially important if the html ticket thread is disabled. In such
a case the message body will still be HTML, but an HTML email should not be
sent out.

Fixes #374

Satisfy lint test engine

Reviewed-By: Peter Rotich <peter@osticket.com>

http: Legacy versions of IIS redirect incorrectly

Reviewed-By: Peter Rotich <peter@osticket.com>