email: Improve user identification from headers

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

This is the correct logic - we'll address issue #1259 separately

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

Previously, the code would scan the email headers until it found a positive
match from any of the email headers scanned. Additionally, it would attempt
to find the user from the tagged email references header. However, this
algorithm assumed that the references header was constant and predictable in
its ordering. Recent tests with Gmail prove otherwise in some tests.

This patch changes the system so that only the tagged reference header is
included in the References header, and it will scan all items in a header
(namely the References header) until both the thread and a user are
identified. If a user can be identified, the thread and user are returned.
Otherwise, the first thread hit is returned.

Ticket status change

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

Redirect to tickets listing page when a ticket is resolved or closed via
status change.

Show different messages and placeholder on ticket(s) deletions

pjax: Navigate away on attachment and download links

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

email: Add MAIL_EOL setting to ost-config.php file

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

oops: Fix crash creating canned responses

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

search: Fix incorrect hits searching assignee

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

This fixes hits when using the MySQL full text search backend

This setting allows administrators to add (uncomment) a MAIL_EOL setting in
the ost-config.php config file to define the line ending used for mail
headers and encoded bodies in outbound mail (SMTP, for instance).

By default, CRLF is used by the SMTP email generator as per the RFC 822
standard. However, many administrators can benefit by setting LF (\n) as the
line ending.

Conflicts:
	include/class.dynamic_forms.php

forms: Fix html rendering of checkbox description

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

forms: Always attempt to look up selection value by name

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

api: Handle ArrayObject like an array for request validation

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

i18n: Fix install crash because of error installing dept

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

i18n: Correctly initialize the word break iterator

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

If there is a problem installing some of the items with the system, try not
to crash simply because the error is passed into another ::create()
function.

Fix incorrect collaborator and owner email links

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

Also, fix duplicate emails where a user as a collaborator would be sent a
confirmation for their own respective email.