TypeDefinition constructor Null safety

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

TypeDefinition class

1. Constructors
2. TypeDefinition
3. Properties
4. hashCode
5. isAbstract
6. isExternal
7. isNullable
8. name
9. reference
10. runtimeType
11. scope
12. typeArguments
13. typeParameters
14. Methods
15. isSubtype
16. noSuchMethod
17. toString
18. Operators
19. operator ==