Use ecm_qt_install_logging_categories over manual categories file
Test Plan:
Entries of generated file match existing file, besides order and
header comments, unless plugin not build, and also for
ISpellChecker & NSSpellChecker (missing so far)
Reviewers: Build System, Frameworks, broulik, mlaurent
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D27178