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

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

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

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

When the identity provider does not provide a validity of the credentials, the Java implementation takes now + 6 months while we took now + 52/2 weeks, which is not always the same. This commit takes the approach of the Java implementation.

When a problem occurs during parsing or verifying a scheme manager or any of its underlying files, this is now stored in the scheme manager struct itself instead. Invalid managers are kept in Configuration.SchemeManagers.

See: https://github.com/privacybydesign/irma_api_server/pull/11

This prevents the 'use of internal package not allowed' go compile error