Support stacked component dialogs

Fix location of Qt.inputMethod.hide()

Rework handling of fw/vehicle type with respect to conflicts with actual vehicle types.

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

helpful for example when editing parameters

Total hack but it seems to work

- More more on making QGCView real
- Converted Parameter Editor to QGCView

- You can now cancel parameter change
- Tablete friendly