EngineNotificationDispatcher constructor Null safety

1. irte_engine
2. engine_notification_dispatcher
3. EngineNotificationDispatcher
4. EngineNotificationDispatcher constructor

EngineNotificationDispatcher class

1. Constructors
2. EngineNotificationDispatcher
3. Properties
4. hashCode
5. hasListeners
6. initialized
7. isClosed
8. listeners
9. onDelete
10. onStart
11. runtimeType
12. Methods
13. $configureLifeCycle
14. addListener
15. addListenerId
16. dispatch
17. dispose
18. disposeId
19. noSuchMethod
20. notifyChildrens
21. onClose
22. onInit
23. onReady
24. refresh
25. refreshGroup
26. removeListener
27. removeListenerId
28. toString
29. update
30. Operators
31. operator ==