LinkInterface/Vehicle uses mutexes to synchronize writing bytes

FirmwarePlugin::adjustOutgoingMavlinkMessageThreadSafe not required to be thread safe

Remove mutex from Vehicle::sendMessageOnLinkThreadSafe.

Use specifiesAltitude instead of specifiesCoordinate in correct places

Fix Android build

Fix Android build

LinkInterface and Vehicle uses mutexes to synchronize writing bytes to the link instead of queued signals

Get XCode Project build working again

Remove unused FlightGear stuff
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Windows build updates
Linux fixes
Fix unit test run directory

CI Test Run

Fix min/max tests

Fix offline vehicle firmware/vehicle type settings

Fake change

Fix unit test run directory

Linux fixes

Windows build updates

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More work

Remove unused FlightGear stuff

Get XCode build working again

Remove altitude mode warning which was causing recursion into dialog …

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