native property Null safety

1. baguette
2. Language
3. Language
4. native property

Language class

1. Constructors
2. Language
3. fromJson
4. Properties
5. code
6. hashCode
7. name
8. native
9. runtimeType
10. Methods
11. noSuchMethod
12. toJson
13. toString
14. Operators
15. operator ==