Instead of having all register calls in subsurface-helper.cpp let
qPref.cpp handle all qPref registration, since they also need to be
different
update subsurface-helper and testqml accordingly.
Signed-off-by: Jan Iversen <jani@apache.org>
add subsurface-helper.cpp to TestQML target
remove local qmlRegisterType() and add register_qml_types() instead
Signed-off-by: Jan Iversen <jani@apache.org>