D27178: Use ecm_qt_install_logging_categories over manual categories file

[Friedrich W. H. Kossebau]

kossebau added a dependency: D27150: Add ecm_qt_install_logging_categories & 
ecm_qt_export_logging_category.

REPOSITORY
  R246 Sonnet

REVISION DETAIL
  https://phabricator.kde.org/D27178

To: kossebau, #build_system, #frameworks, broulik, mlaurent
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns