Function squad

squad(
    startValue: quat,
    endValue: quat,
    startTangent: quat,
    endTangent: quat,
    t: number,
): quat
Parameters
- startValue: quat
  Start value
- endValue: quat
  End value
- startTangent: quat
  Start tangent
- endTangent: quat
  End tangent
- t: number
  Interpolation amount
Returns quat
Interpolated value