* Addded version arg to enqueue scripts function
* Addded retroactive course access checker tool
* Addded filter hook for manual payment methods check
* Addded filter hook for subscription_course_access functions
* Added enroll users on payment complete hook
* Added un-autocomplete transaction if it has physical product
* Added filter and function to allow user to remove course access on subscription billing cycle completion
* Added new translations and udpate class
* Added 'is user enrolled to course' check before enroll new course access
* Added associate related course of variation product to buyer
* Added related courses field to product variation and add save data hook function
* Added version plugin constants
* Added auto complete course order
* Updated functions naming
* Updated orders for bacs and cheque payment methods to prevent auto-completion
* Updated make add-on compatible only with WC 3.0 and above
