Licence hygiene: add LICENSE, header the unheadered files, quarantine the GPL modules - #35

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'include_host_tools', 'fallback_to_source', valid inputs are ['recipe', 'requirements', 'build_type', 'link', 'prefix', 'libcvc_deps_ref', 'catalog_url', 'repository', 'python_version']