Change all license headers to comply with REUSE specification.
Fix#16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
Fixes#21250
Related #20414
Conan packages don't have to follow SemVer.
The migration fixes the setting for all existing Conan and Generic
(#20414) packages.