Merge topic 'license-rst' into release-4.0

2f852580fb CONTRIBUTORS: Improve formatting of per-contributor hyperlinks
8d83487e60 CONTRIBUTORS: Factor contributors list out of license file
1fd8a2be4d LICENSE: Clarify role of copyright in contributions
de273b2e11 LICENSE: Replace references to Copyright.txt with LICENSE.rst
2d42a5444f LICENSE: Rename Copyright.txt to LICENSE.rst
5317564894 Copyright.txt: Add contributor section headers
834c9236e4 Copyright.txt: Remove excess indentation
afeca383d6 Copyright.txt: Drop outdated content around copyright notice line
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Acked-by: Alex <leha-bot@yandex.ru>
Merge-request: !10416