MDL-40054 events: changed instances_list to instance_list
MDL-40056 scorm: Add phpunit data generators for scorm module
MDL-40056 events: Added attempt_deleted scorm event
Add new events to scorm

Following events are added in this patch:-
course_module_viewed
instance_list_viewed
interactions_viewed
report_viewed
sco_launched
tracks_viewed
userreport_viewed
MDL-40056 events: Add unit tests for the new scorm events
MDL-40056 events: Replace add_to_log with new events in scorm