Migrate to a software rasterizer to dramatically improve performance

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

lib/screens/sprite_gallery.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
 import 'package:wolf_3d_entities/wolf_3d_entities.dart';
 import 'package:wolf_3d_flutter/wolf_3d.dart';
-import 'package:wolf_3d_renderer/color_palette.dart';
 
 class SpriteGallery extends StatelessWidget {
   final List<Sprite> sprites;
@@ -76,12 +75,12 @@ class SingleSpritePainter extends CustomPainter {
     double pixelSize = size.width / 64;
     for (int x = 0; x < 64; x++) {
       for (int y = 0; y < 64; y++) {
-        int colorByte = sprite[x][y];
+        int colorByte = sprite.pixels[x * 64 + y];
         if (colorByte != 255) {
           // Skip transparency
           canvas.drawRect(
             Rect.fromLTWH(x * pixelSize, y * pixelSize, pixelSize, pixelSize),
-            Paint()..color = ColorPalette.vga[colorByte],
+            Paint()..color = Color(ColorPalette.vga32Bit[colorByte]),
           );
         }
       }