Version of quat_interpolate() allowing control over the rotation.


void quat_slerp(const QUAT *from, const QUAT *to, float t, QUAT *out, int how);
The same as quat_interpolate(), but allows more control over how the rotation is done. The how parameter can be any one of the values:
      QUAT_SHORT  - like quat_interpolate(), use shortest path
      QUAT_LONG   - rotation will be greater than 180 degrees
      QUAT_CW     - rotate clockwise when viewed from above
      QUAT_CCW    - rotate counterclockwise when viewed from above
      QUAT_USER   - the quaternions are interpolated exactly as

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