Fix #412: Reference of orgnanization images are not deleted.
Fix #412: Reference of orgnanization images are not deleted.

Add 'DeleteImageSetListener' back to 'Core/File/Events' event manager.

kilip/YAWIK,cross-solution/YAWIK,kilip/YAWIK,kilip/YAWIK,cross-solution/YAWIK,kilip/YAWIK,cross-solution/YAWIK,cross-solution/YAWIK