Improve the 3D editor manipulation gizmo

- Allow some tolerance when clicking the plane move/scale,
  even if the click is actually slightly outside the plane
  (similar to Blender).
- Make the rotate manipulation circles visually thinner to be
  less distracting.
- Make the hovered color less saturated to be more distinguishable
  from the non-hovered state.
  - Don't set brightness above 1.0 to prevent the gizmo from glowing
    when hovered.

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