NERtcScreenProfile constructor Null safety

1. nertc
2. nertc
3. NERtcScreenProfile
4. NERtcScreenProfile constructor

NERtcScreenProfile class

1. Constructors
2. NERtcScreenProfile
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. hd480p
13. hd720p
14. hd1080p