GitLab

- 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>

Attributes may now also remotely be made optional.

Before 42a3acc2, more than one instance of the singleton credential type may have been stored.