Make frame time in Renderer a property, update TestGame.

DaggerFramework/Source/Rendering/Renderer.cs

@@ -30,6 +30,7 @@ namespace DaggerFramework.Rendering
         /// </summary>
         public abstract int TargetFps { get; set; }
         public abstract bool VSync { get; set; }
+        public double FrameTime => GetFrameTime();
 
         // WINDOW
         /// <summary>
@@ -52,6 +53,7 @@ namespace DaggerFramework.Rendering
         protected abstract void SetWindowTitle(string title);
         protected abstract void SetWindowVSync(bool value);
         protected abstract void SetTargetFps(int fps);
+        protected abstract double GetFrameTime();
         protected abstract int GetMonitorWidth(int monitorId);
         protected abstract int GetMonitorHeight(int monitorId);
         protected abstract int GetCurrentMonitor();
@@ -76,7 +78,6 @@ namespace DaggerFramework.Rendering
         /// </summary>
         /// <param name="color">Background color.</param>
         public abstract void ClearBackground(Color color);
-        public abstract double GetFrameTime();
 
         /// <summary>
         /// Loads the texture onto the GPU for later use in DrawTexture or other Texture related methods.