Carla not stable / add Catia

1. Update and rework pyqt (rework [1-2]) / move to current Qt
2. Python startup [3]
3. Once fixed: add catia

[1] https://github.com/schnitzeltony/meta-qt5-extra/tree/pyqt5-wip
[2] https://github.com/schnitzeltony/meta-qt5/tree/pyqt-rework
[3] http://lists.openembedded.org/pipermail/openembedded-devel/2019-January/198198.html