Move mailing to its own class

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

Revisit the mail fetching feature

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

Rebased soif/feature/fixes

Reviewed By: Peter Rotich 07/30/12

Add topicId to supported vars (else we can't create a Ticket) & Prevent api posts without attachements to trigger an uggly php error

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

Fixes: Assign Alerts now sent,  InternalNote Alert %message fixed. Added: %assigner to InternalNotes Template

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

Support multiple attachments to a message via the web interface

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

* Improved and better init
* Better attachments handling
* Support for inline attachments

Property handle Unicode and HTML entities

Reviewed By: Peter Rotich 07/25/12