Adds initial aspect-based event commit
Adds working activity feed with no frontend and only support for scan uploads.
Adds feed to application detail page UI.
Updates activity model to support comment submission
Adds activity feed to dashboard
Adds format string
Adds DefectTrackerProjectMetadataEvent.java and related classes
Adds PreDefectSubmissionEvent
Closes #719 by removing the UI elements from the event model.
Merge branch '2.2i4' into qa-sprint