Windows build updates

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More work

Remove unused FlightGear stuff

Get XCode build working again

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

Fix for creation of OSX App XCode Project

Fix for creation of OSX App XCode Project

QGCMapPolygon select vertexes functionality

Help with Qt 5.15 and 5.14 integration

Remove QT_VERSION for old and not supported Qt versions 

Fix location of Qt.inputMethod.hide()

Remove missing support for QGCView fact missing overlays

Cut over to new JSON translation system

Don't try to load Qt en_Us loc

Fix locale setting

Cut over to new JSON translation system

New Crowdin translations

Fix location of Qt.inputMethod.hide()

Remove missing support for QGCView fact missing overlays

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

Add invalid vertex index warning