[VisualizationGraphWidget] Restored box zoom and zones plus refac...
[VisualizationGraphWidget] Restored box zoom and zones plus refac
- Box zoom is mostly working
- Zones can be drawn again but can't be moved
- started to move QCP in pimpl VisualizationGraphWidget shouldn't have
to deal with QCP even know that we use QCP
Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>