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TSK-1914: introduced TaskState.IN_REVIEW and TaskState.READY_FOR_REVIEW. Extend claim, cancelClaim and complete operations accordingly.
TSK-1915: added TaskService#requestReview(String) and TaskService#forceRequestReview(String)
TSK-1916: added TaskService#requestChanges(String) and TaskService#forceRequestChanges(String)
TSK-1937: added AfterRequestReviewProvider which allows customized behavior after a review has been requested on a given Task.
TSK-1938: added AfterRequestChangesProvider which allows customized behavior after changes have been requested on a given Task
TSK-1941: added ReviewRequiredProvider which allows to request a review on a given Task instead of completing it.
Improvements
TSK-1911: Fixed TaskHistoryEvent details regarding corresponding Attachments. Unchanged Attachments are not included in the TaskHistoryEvent anymore.