move various properties away from qapp and to kaboutdata
Summary:
this is possible now that we actually call KAboutData::setApplicationData
which forwards a whole bunch of settings to the qapp
all calls are replaced by KAboutData::setApplicationData
Test Plan: --version|author|help work as expected
Reviewers: kossebau
Reviewed By: kossebau
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D21802