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

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

Further refinements to CredentialInfo to make it consistent with description structs for irma_configuration
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.

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

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