ParameterDeclaration constructor Null safety

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

ParameterDeclaration class

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