Add lights to the vehicle example

[ClemensLinnhoff]

Describe your changes

• Spot lights for all lights on the example vehicle
• Emissive lights for all lights on the example vehicle
  • Mapped by material name
  • With individual texture
  • With atlas texture

Issue ticket number and link

Fixes #460

Checklist before requesting a review

• I have performed a self-review of my code/documentation.
• My changes generate no new warnings during the documentation generation.