Merge branch 'enhancement/relicensing' into 'master'

Switch to Apache 2.0 license.

See merge request !21
6 jobs for v1.6.0 in 5 minutes and 52 seconds (queued for 7 seconds)
latest
Status Name Job ID Coverage
  Test
passed test_arosics #94726

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85.0%
passed test_styles #94727

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passed test_urls #94728

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  Deploy
passed create_github_release #94736

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passed deploy_pypi #94729

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failed create_github_release #94730

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