Finish cron system

[voltan]

• Add cron service
• Update system module to use cron service
• Update order / sitemap modules to use corn service
• Add config on each module for active cron or add general config

[voltan]

Service and configs added, just I add cron system on controller and it be active by link and password set end of link, like this http://localhost/local/pi/pi-251/www/system/cron/index/password-d4b96331322566e04303aa6b70802b3f

I still dont know its true security method or better to add cron as php file and put it out of public_html