D6972: Add CC BY-SA 4.0 International and set it as default

[Luigi Toscano]

ltoscano added a reviewer: yurchor.

REPOSITORY
  R238 KDocTools

REVISION DETAIL
  https://phabricator.kde.org/D6972

To: ltoscano, jriddell, lueck, yurchor
Cc: jriddell, lueck, #frameworks, #documentation, skadinna
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