feat: Refactor renderer key event handling and disable FPS counter by default

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart

@@ -81,7 +81,7 @@ class WolfEngine {
   double get fps => _smoothedFps;
 
   /// Whether renderers should draw the FPS counter overlay.
-  bool showFpsCounter = true;
+  bool showFpsCounter = false;
 
   /// The episode index where the game session begins.
   final int? startingEpisode;