[feature request] include support for more in interface description

[tmds]

It would be useful if interface description includes whether method are expected to support providing multiple replies when more=true.

This allows to generate more appropriate bindings.

cc @haraldh

[haraldh]

Yeah, we discussed that back then... but decided it should be part of the dynamic protocol.

Basically, the client decides, if it accepts more than one reply and the server tells the client, that more is following.