Allow mouse interation in 3D viewport.

[muhuk]

• [x] Panning

  • Blender and Godot both use Shift + MMB

• [x] Zoom

  • Blender and Godot both use mouse scroll and Ctrl + MMB

• [x] Orbiting

  • Blender and Godot both use MMB

• [x] Reset pan and zoom.

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[muhuk]

Example in bevy codebase.