remove use of Math.Clamp()

Shared/SpiderWorld.cs

@@ -23,7 +23,8 @@ namespace SemiColinGames {
 
       public void Update(float modelTime, History<Input> input) {
         radius += 150 * modelTime * input[0].Motion.Y;
-        radius = Math.Clamp(radius, 50, 200);
+        radius = Math.Min(radius, 200);
+        radius = Math.Max(radius, 50);
         float angleChange = modelTime * momentum / radius;
         angle += angleChange;
         float x = anchor.X + radius * (float) Math.Sin(angle);