Function sqlerp

sqlerp(a, b, c, d, t, dst?): Quat
Performs a spherical linear interpolation with two control points
Parameters
- a: Quat
  the first quaternion
- b: Quat
  the second quaternion
- c: Quat
  the third quaternion
- d: Quat
  the fourth quaternion
- t: number
  Interpolation coefficient 0 to 1
- Optional dst: Quat
Returns Quat
result