D6672: add KAboutLicense::spdx and introduce orLater qualification

[Michael Pyne]

mpyne accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R244 KCoreAddons

BRANCH
  spdx

REVISION DETAIL
  https://phabricator.kde.org/D6672

To: sitter, sebas, mpyne
Cc: #frameworks
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