Update WHMCS Module

Added domain sync and transfer sync module.

Installation instructions to enable Sync:

 - Please add to the cron job the file "whmcs.installation"/crons/domainsync.php
   I advise to run it every 24 hours
 - Create an email template called Domain Transfer Completed
 - On the WHMCS-> General Settings -> Domains, uncheck the option Tick this box to not auto update any domain dates