Tweak appearance of 3D editor gizmo icons

- Use alpha scissor to resolve transparency sorting issues with gizmo
  icons relative to other transparent materials in the scene.
  This also makes gizmos visible in `screen_texture`, which means
  gizmos can now be seen through refractive materials.
  Lastly, this reduces the amount of artifacts visible around gizmo
  outlines (although they are still present at times).
- Make icons darker when not selected to be less intrusive
  (and easier to distinguish when selected).

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