Upgrade bullet to 2.82

I upgraded bullet to 2.82. The benchmark works, the tests pass except for one:
in `2.js`, this assertion fails:
```
rayCallback.set_m_collisionObject(Ammo.wrapPointer(195));
assertEq(typeof rayCallback.get_m_collisionObject(), 'object');
```

`rayCallback.get_m_collisionObject()` returns the number 195 instead of the wrapped pointer, do you have an idea why?