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This is a new navigation mode for QgsCameraController which is meant to work just like the terrain-based navigation mode, but for 3D scenes with globe. Initially, the new navigation mode can handle: - zooming in/out with mouse wheel - orbit around globe when dragging with left mouse button pressed - left/right/up/down keys to orbit around globe - shift + left/right keys to change heading angle - shift + up/down keys to change pitch angle - page up/page down keys to increase/decrease elevation For camera pose, we use QgsCameraPose as for "flat" scenes, but the QCamera is positioned/rotated slightly differently - the main change is that in case of globe, we use ECEF coordinates of the camera pose's center point, convert them to lat/lon coordinates in order to set up initial rotation of the camera so that it is perpendicular to the tangent plane at the given ECEF coordinate.