Convert license headers to SPDX format

2 jobs for master in 45 minutes and 36 seconds (queued for 109 minutes and 29 seconds)
Status Job ID Name Coverage
  Build
passed #62231
build_clazy_clang_tidy

00:27:24

passed #62230
linux kf5-qt5 qt5.12

00:18:11

56.0%