NERtcVoiceChangerType constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERtcVoiceChangerType
4. NERtcVoiceChangerType constructor

NERtcVoiceChangerType class

1. Constructors
2. NERtcVoiceChangerType
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. giant
13. horror
14. manToLoli
15. manToWoman
16. mature
17. off
18. robot
19. womanToLoli
20. womanToMan