Round-trippable object representations

[klauer]

It would be nice if, for example, you could generate a .db file from a Database dataclass, or a .proto file from a StreamProtocol.

This would assuredly poke holes in things like poor comment-handling, but it could be useful for automatic reformatting and such.

The jinja templates probably have enough flexibility to do this, so it'd be a matter of adding a key for this type of representation and a new format for nearly every dataclass (... not a small task).