NERtcScreenConfig constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERtcScreenConfig
4. NERtcScreenConfig constructor

NERtcScreenConfig class

1. Constructors
2. NERtcScreenConfig
3. Properties
4. bitrate
5. contentPrefer
6. frameRate
7. hashCode
8. minBitrate
9. minFrameRate
10. runtimeType
11. videoProfile
12. Methods
13. noSuchMethod
14. toString
15. Operators
16. operator ==