oops: Fixup registration for existing users

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

This occurs for attachments added via the staff or client web interfaces

Upgrade to Redactor 9.2.1

PJAX for the staff control panel

Conflicts:
	view.php

Registered email includes users without an "account"

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

Use .domain.tld to accept all subdomains of a parent

This is a slight edit over the previous implementation of the same feature.
Previously, an "account" was required, which implies a user account with a
password. This implementation simply requires a user record. Importing of
users by organization domain is still supported -- even if the user does not
yet exist.

Add contacts to organization

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

Inline images in email without a 'cid:' indicator

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