NotificationDispatchers constructor Null safety

1. irte_engine
2. notification_dispatchers_service
3. NotificationDispatchers
4. NotificationDispatchers constructor

NotificationDispatchers class

1. Constructors
2. NotificationDispatchers
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. dispatchNotification
17. dispose
18. disposeId
19. noSuchMethod
20. notifyChildrens
21. onClose
22. onInit
23. onReady
24. refresh
25. refreshGroup
26. registerDispatcher
27. removeListener
28. removeListenerId
29. toString
30. update
31. Operators
32. operator ==
33. Static properties
34. instance