FieldDeclaration constructor Null safety

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

FieldDeclaration class

1. Constructors
2. FieldDeclaration
3. Properties
4. hashCode
5. isAbstract
6. isExternal
7. name
8. runtimeType
9. type
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==