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Co-authored-by: Confiks <confiks@scriptbase.org>

- Sessions now start with a SessionRequest instead of the requestor's JWT
- Move protocol version negotiation to later in the protocol to decouple QR contents from SessionRequest
- Fix legacy in protocol
- Support for multiple keyshare servers in issuance sessions
Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

- Extract raw information from session, and only derive for display
- Add protocol version and ABS timestamps in log entries. Include an update function for existing logs
- AttributeValue of AttributeResult is now a TranslatedString
- Removed polymorphic 'response' from log entry; populate either IssueCommitment or Prooflist instead
- Greatly simplified marshalling log entries by not using a separate struct
- Added tests for disclosure logging
Co-authored-by: Sietse Ringers <mail@sietseringers.net>

This also required adding support for calculating the metadata version
based on the protocol version, and sending the current protocol version
to the server as a hint.

The struct name now matches exactly (up to idiomatic spelling differences)
with the name of the folder that it parses and updates.