An experiment to make funcs on interfaces look like methods.

Noop on behavior.
Trying this out to learn the advantages/disadvantages of doing this.
gofmt -r 'GlobalToParent(w, g) -> WidgeterS{w}.GlobalToParent(g)'.
gofmt -r 'GlobalToLocal(w, g) -> WidgeterS{w}.GlobalToLocal(g)'.