Add overloads for C# Interface to use flat vector with `unsafe` to speedup passing rays

[mariuszhermansdorfer]

This PR has a bunch of minor optimizations to the raycasting API:

• Add an overload for the Embree raytracer to accept float[] as input
• Use unsafe methods to iterate over arrays for faster conversions

Test results:

[cadop]

Is there something in your gitignore or a missing commit? I can't build this branch

[mariuszhermansdorfer]

Try building it now @cadop.

I reverted all classes back to static and added the missing reference to CMakeLists. Previously I had it added manually here:

[cadop]

When you get a chance could you edit the original comment for this PR and paste a screenshot of the hfcsharptest group all passing. I need to setup the automated testing on github runners, but until that happens, i'll just need to have people post that the unittests pass, and then ill review the code and test on other platforms.

[mariuszhermansdorfer]

When you get a chance could you edit the original comment for this PR and paste a screenshot of the hfcsharptest group all passing. I need to setup the automated testing on github runners, but until that happens, i'll just need to have people post that the unittests pass, and then ill review the code and test on other platforms.

Updated the initial comment and added a screenshot of all tests passing.

[cadop]

Didn't mean to close this, it was because I deleted the other branch when merging it. You can rebase on main and reopen this PR to be merged into main (and ill change it).

• You shouldn't need to make a new PR, just reopen this one