Swagger/postman codegen

OK, it might be an urge work, but it would be really great to have a code generator to create custom nodes from a swagger file or a postman collection (like in Microsoft flow)

A while ago I wanted to create a node that can read them directly. But that is currently however not possible with how nodes get loaded and would so probably need a bigger change.
So it is a great idea to create a separate tool to create a full node out if it. It would also be helpful later because much of the code could be reused when a Swagger/Postman node can be created which reads the configuration directly.