Responder Authentication for Online? protocol#19
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This adds the responder authentication property to the Online? protocol.
The proof structure works with one event per protocol step (per state). The state predicates forward to the corresponding event predicates.
Since the crypto predicates also refer to the events, we have the order trigger event, send message, set state in the protocol steps.
The PR also contains some cleanup to make the three models of the Online? protocol consistent.