SpeechPackFileController constructor Null safety

1. irte_engine
2. speech_pack_file_controller
3. SpeechPackFileController
4. SpeechPackFileController constructor

SpeechPackFileController class

1. Constructors
2. SpeechPackFileController
3. Properties
4. conditionsFile
5. hashCode
6. hasListeners
7. initialized
8. isClosed
9. listeners
10. onDelete
11. onStart
12. runtimeType
13. storageDir
14. Methods
15. $configureLifeCycle
16. addListener
17. addListenerId
18. directoryFor
19. dispose
20. disposeId
21. extract
22. fileFor
23. loadConditions
24. noSuchMethod
25. notifyChildrens
26. onClose
27. onInit
28. onReady
29. refresh
30. refreshGroup
31. removeListener
32. removeListenerId
33. resolveSpeechFiles
34. toString
35. update
36. Operators
37. operator ==
38. Static properties
39. instance
40. Static methods
41. extractFiles