Return values for odmActions

[asoloway64]

We need to decide the best way to represent return values for actions.

[mjkoster]

... which is a continuation of the issue #8

Specifying which data items are call arguments and which are return values sometimes gets into optionality of protocol bindings.

I agree we need a design to reflect this without being overly prescriptive as to how things are packaged in the protocol

[WAvdBeek]

not really i think this means that there is a classification for each argument in the action if it is an input or an output.
or define an action with an list of parameters being the input and a list of parametes being the output.