Code cleanup.

Runtime/animation/curves.cs

         public static readonly Curve linear = new _Linear();
 
         public static readonly Curve decelerate = new _DecelerateCurve();
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         public static readonly Cubic easeInOutBack = new Cubic(0.68f, -0.55f, 0.265f, 1.55f);
 
         public static readonly Curve fastOutSlowIn = new Cubic(0.4f, 0.0f, 0.2f, 1.0f);