Fix ASCII rasterizer scaling for CLI

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

packages/wolf_3d_engine/lib/src/ascii_rasterizer.dart

@@ -47,19 +47,21 @@ class ColoredChar {
 }
 
 class AsciiRasterizer extends Rasterizer {
-  final AsciiTheme activeTheme = AsciiThemes.blocks;
+  AsciiRasterizer({
+    this.activeTheme = AsciiThemes.blocks,
+    this.aspectMultiplier = 1.0,
+    this.verticalStretch = 1.0,
+  });
+
+  AsciiTheme activeTheme = AsciiThemes.blocks;
 
   late List<List<ColoredChar>> _screen;
   late WolfEngine _engine;
 
-  // Terminal characters are usually twice as tall as they are wide.
-  // We override the base multiplier to squish sprites horizontally.
   @override
-  double get aspectMultiplier => 1.0;
-
-  // Squish the entire 3D projection vertically by 50% to counteract tall terminal fonts
+  final double aspectMultiplier;
   @override
-  double get verticalStretch => 1.0;
+  final double verticalStretch;
 
   // Intercept the base render call to initialize our text grid
   @override