D27571: Convert license headers to SPDX identifiers

[Andreas Cord-Landwehr]

cordlandwehr added a task: T11550: Add SPDX License markers.

REPOSITORY
  R490 KDAV Library

REVISION DETAIL
  https://phabricator.kde.org/D27571

To: cordlandwehr, vkrause
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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