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Box2D 3.0 Released

Over 18 months ago I announced that I was working on Box2D version 3.0 (v3 for short). And it has finally arrived! It has been a long journey and I've learned a lot. There is more work to do, but the library is ready to be used for game development. I'd like to thank the Box2D users who tested v3 during the alpha and beta. Their feedback and bug reports have been super helpful!

All internal data is hidden in the src directory, making the public include headers smaller and easier to read. MSVC is behind the current C standard, making some things harder than they should be (e.g. multithreading) I want a simple type-safe dynamic array with bounds checking. Along the way I decided Box2D should support multithreading large piles of bodies, especially after seeing Petri Purho discuss the technology behind Noita.

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