public static GsColor Darken(this GsColor color, float amt = 0.5f)
 {
     return(GsMath.Lerp(color, GsColor.Black, amt));
 }
 public static GsColor Lighten(this GsColor color, float amt = 0.5f)
 {
     return(GsMath.Lerp(color, GsColor.White, amt));
 }