When the php mail function is used to send email, this change adds error logging if an error is detected by PEAR

Conflicts:
	WHATSNEW.md
	include/class.dynamic_forms.php
	include/class.forms.php
	include/class.thread.php
	include/i18n/en_US/help/tips/settings.email.yaml
	include/staff/tickets.inc.php
	scp/tickets.php

orm: Port Ticket class to ORM

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

This is one of the last milestones for osTicket on an ORM. Unfortunately, it
doesn't make any remarkable speed increases at the moment.

The ORM will cache the structure of the underlying tables (fields and such)
in APC, and will needs to ensure such data is purged when the table
structures change.

Conflicts:
	include/class.attachment.php
	include/class.config.php
	include/class.forms.php
	include/class.orm.php
	scp/css/scp.css

Feature/tasks stabilize

forms: Add ability to delete properties form

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

file: Allow different names for duplicated content

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

This adds ability to delete properties on list deletion

This patch (which needs further development), introduces an extra field to
the %attachment table to store a file's name, in the event that two files
with the same content are stored in the database with differing names. In
such a case, the name is stored in the %attachment table. This allows the
attachment to specify a different name each time the same file is attached
to something in the system.

forms: Retire old columns from %form_field table

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

* Rename config var enable_html_thread to enable_richtext
* Copy config var name_format to agent_name_format and client_name_format
  and delete it

This stems from a bug not clearing the org_id when removing organizations

Also make forms deleteble by marking them as deleted and hiding them from
the form listing. This ensures that custom data always has a link back to
the form.

These fields have been consolidated into the `flags` column.

Feature :: Thread events

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

Make a couple improvements on the html -> text system

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

search: Fix several small issues with search indexing

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

Add Agents and Users setting pages
Move global settings to System settings