Migrate to a software rasterizer to dramatically improve performance

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

packages/wolf_3d_renderer/lib/weapon_painter.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
-import 'package:wolf_3d_renderer/color_palette.dart';
 
 class WeaponPainter extends CustomPainter {
   final Sprite? sprite;
@@ -24,11 +23,11 @@ class WeaponPainter extends CustomPainter {
 
     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) {
           // 255 is our transparent magenta
-          _paint.color = ColorPalette.vga[colorByte];
+          _paint.color = Color(ColorPalette.vga32Bit[colorByte]);
 
           canvas.drawRect(
             Rect.fromLTWH(