TypeReference constructor Null safety

1. macro_builder
2. definition
3. TypeReference
4. TypeReference constructor

TypeReference class

1. Constructors
2. TypeReference
3. Properties
4. hashCode
5. isNullable
6. name
7. reference
8. runtimeType
9. scope
10. typeArguments
11. Methods
12. noSuchMethod
13. toString
14. Operators
15. operator ==