This adds the concept of a PasswordPolicy registration system, which
provides an extensible way of administering and configuring password
complexity policies.

It also adds a setPassword() method for the authentication backends which
will allow for the respective backend up update the password according to
whatever method is suitable for the respective backend (such as remote
updates for LDAP).

bugs: Fix collaborators lookup

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

lists: Update list management page

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

Conflicts:
	include/staff/tickets.inc.php

bugs: Fix  help topic create + forms

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

topic: forms: Hide forms with no visible fields

Upgrader bug fixes

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

upgrader: Log SQL errors

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

Conflicts:
	assets/default/css/theme.css
	include/client/tickets.inc.php
	include/staff/templates/tickets.tmpl.php
	include/staff/ticket-view.inc.php
	include/staff/tickets.inc.php
	scp/css/scp.css

Conflicts:
	include/class.list.php

filter: Fix filtering by list item properties

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

Collaborators for threads, lock as a utility

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