distance property Null safety

1. irte_engine
2. run_result_controller
3. RunResultController
4. distance property

RunResultController class

1. Constructors
2. RunResultController
3. Properties
4. distance
5. hashCode
6. hasListeners
7. initialized
8. isClosed
9. listeners
10. onDelete
11. onStart
12. result
13. runtimeType
14. speed
15. Methods
16. $configureLifeCycle
17. addListener
18. addListenerId
19. dispose
20. disposeId
21. noSuchMethod
22. notifyChildrens
23. onClose
24. onInit
25. onReady
26. refresh
27. refreshGroup
28. removeListener
29. removeListenerId
30. toString
31. update
32. updateDistance
33. updateResult
34. updateSpeed
35. updateValues
36. Operators
37. operator ==
38. Static properties
39. instance