Extend CodeMeta vocabulary to qualify author relationships

The current CodeMeta vocabulary needs to be extended to accommodate

the rich set of contributor roles identified in https://hal.archives-ouvertes.fr/hal-02135891

the possibility of adding multiple affiliations to any Person entity

Issue on CodeMeta repository: https://github.com/codemeta/codemeta/issues/240

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Migrated from T2329 (view on Phabricator)