config property Null safety

1. irte_engine
2. bg_geolocation_controller
3. BgGeolocationController
4. config property

BgGeolocationController class

1. Constructors
2. BgGeolocationController
3. Properties
4. config
5. hashCode
6. hasListeners
7. initialized
8. isClosed
9. listeners
10. locationCount
11. locations
12. onDelete
13. onStart
14. runtimeType
15. started
16. stopwatch
17. Methods
18. $configureLifeCycle
19. addListener
20. addListenerId
21. addLocation
22. destroyLocationUpdates
23. dispose
24. disposeId
25. noSuchMethod
26. notifyChildrens
27. onClose
28. onInit
29. onReady
30. refresh
31. refreshGroup
32. removeListener
33. removeListenerId
34. startListening
35. stopLocationUpdates
36. toString
37. update
38. Operators
39. operator ==
40. Static properties
41. instance
42. maxLocations