Refactor and more appropriately organize logic

- move play logic to simulation module
- update play hotkey to call play game/scene delegate function
- link hotkey tooltip text to inputOptions

Source/Editor/Windows/GameWindow.cs

@@ -303,7 +303,7 @@ namespace FlaxEditor.Windows
             Editor.Options.OptionsChanged += OnOptionsChanged;
             OnOptionsChanged(Editor.Options.Options);
 
-            InputActions.Add(options => options.Play, Editor.Simulation.RequestPlayOrStopPlay);
+            InputActions.Add(options => options.Play, Editor.Simulation.DelegatePlayOrStopPlayInEditor);
             InputActions.Add(options => options.Pause, Editor.Simulation.RequestResumeOrPause);
             InputActions.Add(options => options.StepFrame, Editor.Simulation.RequestPlayOneFrame);
         }