* Add db field to v_fax_queue to link to fax log
* Add fax_duration field to v_fax_logs
Add fax duration to db to allow for logging of this data for fax email templates.
* Add new email variables to fax send
* Fix some logging variables and fax_log_uuid
Added back some missing session variables for the fax log.
Also update the email queue db field with the fax_log_uuid to allow us to add variables to the fax email templates later.
* Update hangup_tx.lua
