Merge pull request #5842 from wingtra/feature/offlineElevationData

qgroundcontrol.pro

src/QtLocationPlugin/QGCMapEngine.cpp

src/QtLocationPlugin/QGCMapEngine.h

src/QtLocationPlugin/QGCMapTileSet.cpp

src/QtLocationPlugin/QGCMapUrlEngine.cpp

src/QtLocationPlugin/QGCMapUrlEngine.h

src/QtLocationPlugin/QGeoMapReplyQGC.cpp

src/QtLocationPlugin/QMLControl/OfflineMap.qml

src/QtLocationPlugin/QMLControl/QGCMapEngineManager.cc

src/QtLocationPlugin/QMLControl/QGCMapEngineManager.h

src/Terrain/TerrainQuery.cc

src/Terrain/TerrainQuery.h

src/TerrainTile.cc

src/TerrainTile.h