Add copy_txt function to qPrefPrivate class
Remove macro COPY_TXT from qPrefPrivate.h
Replace use of COPY_TXT with copy_txt in qPref classes
copy_txt is only once, COPY_TXT was expanded approx. 160 times, so
this commit saves space (and removes a macro).
Signed-off-by: Jan Iversen <jani@apache.org>
Add qPrefPrivate class which contains one QSettings variable,
delete QSettings from qPref* class definitions
this secures there are only instance of QSettings
(QSettings needs to be in a QObject class to work)
Signed-off-by: Jan Iversen <jani@apache.org>