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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>

When parsing irma_configuration, we now check the timestamp of each scheme manager to decide if that manager must be copied out of the assets into storage, instead of the (scheme manager-transcending) file irma_configuration/timestamp.

Previously, an attribute disjunction erroneously either had no values for any of the
attributes, or it required a value for all attributes. A required value of null in an
attribute disjunction now specifies that the disjunction imposes no value on the attribute.

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.

Put unit test helper functions in internal package to make them available to unit tests of all packages

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