If a new PJAX request is started before the current PJAX request finishes,
leave the user interface in a consistent state.

  * Finish and re-start the loadingbar animation
  * Ensure the overlay is hidden
  * Cancel all current animations (without using clearTimeout)

This also fixes other nuances such as the help tips not working after the
PJAX ui state was corrupted.

oops: Fix a few small issues

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

Conflicts:
	include/class.ticket.php
	include/class.user.php
	include/i18n/en_US/help/tips/settings.alerts.yaml
	include/staff/department.inc.php
	include/staff/settings-alerts.inc.php
	include/staff/slaplan.inc.php
	include/staff/ticket-view.inc.php

Add user and organization context to filters

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

Enhancements

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

Add ability to disable canned responses
Fix team drop down selection
Remove priority escalation setting in SLA page (implementation is on todo
        list)

captcha field without autocomplete

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

Allow developers to specify a sorting position for groups of fields
selectable in the criteria select drop-down

Load sample organization with custom data/fields

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

Make the organization page happy!

oops: Add "size" to allowed API properties for attachments

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

Fix images in new ticket notice to end user

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

Show close date on closed tickets queue

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

Make mail parsing more memory efficient

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

Remove usage of preg_match_all for large strings

bounce: Handle rfc/1892 style bounce notices

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

ldap: Attempt auto client registration for all backends

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

alerts: Send new note alert to assigned team members

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

Sometimes an MTA may just send back the headers of the original message
rather than the entire original message. Such an email will have a
`text/rfc822-headers` part which will be the complete headers of the
original message.

Without this patch, osTicket will create a new ticket for the bounce message
rather than attaching the new internal note to the existing ticket.

References:
https://tools.ietf.org/html/rfc1892

Consider closed date to determine ticket's last activity date. The net effect is closed tickets queue will be sorted by closed date.

Departments without email will use the system default email as the default
outgoing email.

The setting is useful in making sure the staff members with access to the
department can get alerts and available as possible assignees.

Accept desired $format as part of class instantiation. System default is
used when none or an invalid format is provided

Add department setting to limit ticket assignment within department to
department members only. This is necessary for departments with strict
policy on who can access tickets.

The setting doesn't limit team assignment or auto-assignment via help topics
and ticket filters.

This patch uses a 'StringView' to create a string which is a window of
another string. The __toString() method is employed to fetch a lazy copy of
the window which can be usually immediately discarded. This is optimal for
one-time-use string copies like what is used in the mail parsing.