v3.1 Tasks

[erincatto]

• [ ] sample character mover
• [ ] smooth manifold merger
• [ ] world serialization
• [x] floating point determinism
• [ ] rolling resistance
• [ ] infinite planes
• [x] 64 bit category and mask bits

[erincatto]

https://box2d.org/posts/2024/08/determinism/

[erincatto]

I investigated using realloc, but alignment is not well supported.