Class SmoothDamp

The naive implementation of so-called SmoothDamp. Pretty much the same as CDS, but it has a way easier parameter to tweak, smoothTime.

Ref: Game Programming Gems 4, Chapter 1.10

See: https://github.com/Unity-Technologies/UnityCsReference/blob/a2bdfe9b3c4cd4476f44bf52f848063bfaf7b6b9/Runtime/Export/Math/Mathf.cs#L308