Add a 3D gizmo to quickly change the 3D view

[skadge]

Many 3D CAD software feature a small 3D gizmo in the top right corner, to help understanding the 3D orientation of the scene, and quickly change/reset the 3D view.

For instance:

• Blender:
  

• FreeCAD:
  

Something similar would be convenient in FlatFab, instead of going back to the 'View' menu every time