Added Partner setting for enabling visibility of Advertiser data

Visibility of Adv variables for Partners is a global setting which means that all of your Partners or none of your Partners can access this data. Adv variables are used exclusively in the Advertiser postback/pixel to pass data from your Advertiser's system to Everflow. To enable this feature, go to Control Center - Configuration > Global Settings > Edit. 

Enabling this setting allows Partners to view adv1-5 in reporting in their portal. They will see this data in any Entity Report > Detailed View, the Conversion Report, as well as the Flex, Dimensional and Dynamic Nested Reports under Analytics.