Fix tests and rename classes with typeparams according to conventions.

src/Avalonia.Animation/Keyframes/KeyFramesStateMachine.cs → src/Avalonia.Animation/Keyframes/KeyFramesStateMachine`1.cs

@@ -30,7 +30,6 @@ namespace Avalonia.Animation.Keyframes
         private Animation _targetAnimation;
         private Animatable _targetControl;
         internal bool _unsubscribe = false;
-        double _outputTime = 0d;
         private IObserver<object> _targetObserver;
 
         private enum KeyFramesStates

src/Avalonia.Animation/Timing.cs

@@ -15,7 +15,7 @@ namespace Avalonia.Animation
     /// </summary>
     public static class Timing
     {
-        static ulong _animationsFrameCount, _transitionsFrameCount;
+        static ulong _transitionsFrameCount;
         static PlayState _globalState = PlayState.Run;
 
         /// <summary>