We can now pass more than one set of `nonce_pks` when creating a CFD.
Each set corresponds to (and is identified by) a different oracle
event, allowing us to construct CFDs which can be settled via oracle
attestation at more than one point in time.
We also remember the CET-event relationship in `CfdTransactions`. This
is needed so that we can select the correct CET when the oracle
attests to the outcome of an event. Additionally, we save the
`nonce_pks` to more easily verify the adaptor signatures.
We also stopped generating random oracle-related values for the
protocol tests, greatly simplifying the test suite. This has the
side-effect that we no longer verify that _all_ CETs can be unlocked.
Re-introducing random oracle-related data in the future should be
considered.
Caused trouble because of route collisions, so the integration was done now.
Required distinguishing Maker and Taker on the cfd level, which comes in handy anyway.
We distinguish by order origin, but still map to a `Role` enum (`Taker` / `Maker`) for readability.
To avoid duplication the `Role` from contract setup was moved into the model and used throughout.
Philipp Hoenisch
Lucas Soriano del Pino
Daniel Karzel
Thomas Eizinger