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Null attributes are attributes with bigint value 0, meaning that the issuer skipped that attribute. Instead of aborting the session, the irmaclient now allows disclosures of null attributes, when the verifier requests it. This allows the irmaclient to prove that a particular attribute was not issued to it, and allows verifiers to request optional attributes alongside other attributes.

Within a session request, inner conjunctions requesting specific attribute values
used to be serialized to a map. JSON and Go maps are however unordered, and the
order matters: if the requested attributes are received in a different order then
the session will fail. Inner conjunctions using values are now serialized using
the default Go serializer, resulting in a list of requested attributes with their values.

Within an inner conjunction of a session request, distinct attributes that come
from the same credential type must always be adjacent. This is now enforced in
the irmaclient and server packages when receiving session requests.

feat: Breaking change: support conjunctions of disjunctions of conjunctions when requesting attributes in any of the three supported session types

Instead of requesting several attributes, one can now request several groups of attributes. Within each such group, attributes belonging to the same credential type always come from the same credential instance. This affects all three session types, as in each of them attributes can be disclosed.

Resolves #21
Co-authored-by: Ayke van Laethem <aykevanlaethem@gmail.com>

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>