Add an ability to rotate the editor camera using scene gizmo

[mrDIMAS]

Add an ability to rotate the editor camera using scene gizmo:

Rotation should happen if a user clicks on the gizmo and starts dragging the mouse while holding the button. Ordinary clicks should switch views as before. Scene gizmo is located in editor/src/scene_viewer/gizmo.rs

[Fedron]

I would like to take this one on if possible?

[mrDIMAS]

Hi, yeah, this issue seems to be quite easy to fix, so you can try it.