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StartTestKeyshareServer now takes a logger argument, and this is used to pass test loggers for the various tests.

Reorganized testing support code to eliminate circular dependency on main package from irmago tests.

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.