Reword to use sizeToContents on combos for flight mode channels

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

Switch threshold highlighting support

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

UI Tweaks for all mobile platforms.

all calls to qsTr are done, if I didn't forget anything,
on the PX4 QML files.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>