Better Transform meta object

[Walther]

Currently, there's a manually-implemented RotateY meta object and a manually-implemented Translate meta object.

These should be combined into a single Transform meta object that can be used for:

• scale (i.e. make larger, smaller)
• translate (i.e. offset in space)
• rotate (with all three axes)

Additionally, instead of manually implementing these, use nalgebra's builtin transform mechanisms for these for maximal robustness and correctness.

[Walther]

Implement based on this blog post: https://jacco.ompf2.com/2022/05/13/how-to-build-a-bvh-part-6-all-together-now/