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The server now responds with a "required attribute missing" error in case
a non-optional attribute is missing from the request, after trying
to redownload the configuration to see if it was tagged optional in the
meantime. This change required to extend the IrmaIdentifierSet with an
extra field that tracks missing AttributeTypeIdentifiers. Code that
populates this struct is also updated accordingly for possible future
consumers.

Client return url

In production nmode the defaults of several server configuration options should change to be more restrictive. When enabling production mode in a configuration file this would not happen.

feat: rename --authmethod to --auth-method flag to irma session for consistency with Configuration struct

- emit version number when running `irma` without subcommand
- `irma session` example uses default `irma server` port