SpeechDispatchController constructor Null safety

1. irte_engine
2. speech_dispatch_controller
3. SpeechDispatchController
4. SpeechDispatchController constructor

SpeechDispatchController class

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