Improves ASCII rasterization speed and simplifies API

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

apps/wolf_3d_gui/lib/screens/game_screen.dart

@@ -37,6 +37,7 @@ class _GameScreenState extends State<GameScreen> {
       data: widget.data,
       difficulty: widget.difficulty,
       startingEpisode: widget.startingEpisode,
+      frameBuffer: FrameBuffer(320, 200),
       audio: widget.audio,
       input: widget.input,
       onGameWon: () => Navigator.of(context).pop(),