Generate render schema from Talisa schema?

[dyoder]

We could eventually give gadgets a schema and make that accessible via Talisa's type interface. We could then generate much of the Gadget Editor schema from that. However, the missing bit of information is which fields to render. Presently, the only field we don't render is the type, but perhaps there will be other cases? In addition, there's the problem of dealing with nested fields, which is handled nicely by the editor schema.