[nem-en] [Proposal] Extend Record or Accesor macro to create PODtypes

[vc]

> I would prefer a separate macro to mark (chosen) members with (any)
> attribute. It could look like
> 
> [MarkWithAttribute (Public, Fields, Include = [foo, bar])]
> class A {
>   foo : int;
>   bar : int;
>   waa : int;
> }

It's access *modifiers*. "Attribute" very overloaded word.