Fix various display properties

[JLBegin]

• Fixed a few display properties inside ImagingPath that were not linked to the Figure.
• Fixed some design parameters that were not accessible from the design() method.
• Added showObjectImage design parameter. Useful when using non-interactive display to hide the ObjectRays group.
• Allow creation of Point(fixToAxis=False) objects that are not anchored to the Z-axis (still anchored by default). Useful if the user wants to draw custom points on the display.

[dccote]

Il y a beaucoup de warnings par rapport a l'utilisation de "is" au lieu de " == " dans figure.py. Peux-tu les corriger? Ca apparait lorsqu'on roule les tests.

En fait, je pense que le mieux serait de prendre issubclass pour etre plus general.

/Users/dccote/GitHub/RayTracing/raytracing/figure.py:207: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'ObjectRays':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:217: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'LampRays':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:226: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'ObjectRays':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:231: SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif instance is 'LampRays':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:389: SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif type(rays).__name__ is 'LampRays':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:551: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if backend is 'matplotlib':
/Users/dccote/GitHub/RayTracing/raytracing/figure.py:569: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if backend is 'matplotlib':
/Users/dccote/GitHub/RayTracing/raytracing/graphics.py:456: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'Lens':
/Users/dccote/GitHub/RayTracing/raytracing/graphics.py:458: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'Space':
/Users/dccote/GitHub/RayTracing/raytracing/graphics.py:460: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if instance is 'Aperture':
...

[JLBegin]

Il y a beaucoup de warnings par rapport a l'utilisation de "is" au lieu de " == " dans figure.py. Peux-tu les corriger? Ca apparait lorsqu'on roule les tests.

Ok ce n'était pas visible de mon côté, mais je comprends que ca vient de Python 3.8+. Je vais corriger ca.