Write @State and @Extra to Parcel instead of Bundle

[jankovd]

Increases complexity but:

• it would be more performant.
• it would support every imaginable object type.
• would allow for two new annotations for types to be introduced: @StateFields and @ExtraFields which would allow the user to specify the fields as key/type mapping in the annotation instead of defining them as instance fields.
• the user could read @State and @Extra annotated properties by directly accessing the fields in the generated class.

Low priority.

[jankovd]

Archiving project.