operator<< for geometry primitives in JSON format for debug purposes

[orgarten]

Status

READY

Description

I added operator<< to the following primitives and collections:

• Sphere & SphereCollection
• Cylinder & CylinderCollection
• Plane & PlaneCollection
• Triangle & TriangleMesh

The output format is JSON which is also used within the node.

Type of Change

• [ ] bug fix
• [x] new features
• [ ] documentation
• [ ] other

How to test the PR

To test the output add something like

std::cout << cylinders << "\n"; 

to the test_cylinders test cases.

Checklist

• [x] I have run the provided clang-format
• [x] I have reviewed my code and commented if necessary
• [ ] I have added the appropriate documentation
• [ ] I have added tests to my new code
• [x] All tests pass locally

[orgarten]

Added debug output to BlazertScene, Ray and RayHit

next: add them to the corresponding EmbreeObjects

[orgarten]

This is ready to be merged now. I have added output operators for the embree primitives as well.