* Use const where possible
* Use C++ math types where possible
* Use std::array of vector types instead of raw arrays where possible
The main areas untouched here are functions which currently do not have
a C++ equivalent (math_geom.cc) and some clip plane arguments which are
wider-reaching than just this file (PBVHFrustumPlanes).
Pull Request: https://projects.blender.org/blender/blender/pulls/128931
a68cad4d59