Add rotation widget to 3D viewport
Created by: JFonS
Video demo: https://streamable.com/p4sw4
I think this is feature complete now so I removed the draft status. It now handles the overlap with the FPS label properly, there is an option to enable/disable the "auto orthogonal" behavior and an editor setting to hide/show the viewport rotation gizmo.
Any feedback can go in the godot-proposals repo: https://github.com/godotengine/godot-proposals/issues/185