Converts a quaternion to an axis-angle rotation.

// Returns the vector (1, 1, 1)
const rotated = Chalkboard.quat.toRotation(
Chalkboard.quat.fromAxis(Chalkboard.vect.init(0, 0, 1), Chalkboard.PI(0.5)),
Chalkboard.vect.init(1, 0, 1)
);