[Ur] Forms that call rpc instead of redirect

[Aistis Raulinaitis]

The form mechanism is excellent, with the built in type checking, but the
submit action function returns a page: state -> transaction page.

Is there such a thing such as a version of forms that has a submit action
function with a type of: state -> transaction unit.

This is so I can call rpc functions there in the submit action and then the
current page is updated using responses over a channel from the server.
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