Add convenient overrides for functions with static masks like `vector_mix_xyxy`

[nfrechette]

See #189 for discussion.

The idea is to add various overrides for functions that take static arguments such as vector_mix<...> to streamline code readability. These should be generated through a python script to make it easier for IDEs to parse comments etc and allow for potentially directly inlining the implementation to make debugging easier.

We could have vector_mix_xyxy, vector_mix_wxyz, etc.

However, this requires a massive number of overrides which can significantly slow down compilation time. To avoid this, we should probably either make it optional in its own header (per function?) and/or make use of C++20 modules/header units. Modules seem like a good fit but bring their own challenges.