repository property Null safety

1. irte_engine
2. sync_controller
3. SyncController
4. repository property

SyncController class

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