The goal is to move to more data oriented design, reducing memory
usage and simplifying code by clarifying data access, avoiding
unnecessary levels of abstraction, and reusing code.
- Simplify threading with the C++ threading API
- Pass the faces to update with an IndexMask instead of a pointer array
- IndexMask uses less memory and simplifies masking and iteration
- Store the grid to face map with indices instead of pointers
- Now this is exactly the same as `build_loop_to_face_map`
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