Starting to move data loader to its own package

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

lib/features/entities/pushwall_manager.dart

@@ -1,12 +1,12 @@
 import 'dart:math' as math;
 
-import 'package:wolf_dart/classes/matrix.dart';
+import 'package:wolf_3d_data/wolf_3d_data.dart';
 import 'package:wolf_dart/features/entities/map_objects.dart';
 
 class Pushwall {
   int x;
   int y;
-  int mapId; // The wall texture ID
+  int mapId;
   int dirX = 0;
   int dirY = 0;
   double offset = 0.0;
@@ -19,7 +19,7 @@ class PushwallManager {
   final Map<String, Pushwall> pushwalls = {};
   Pushwall? activePushwall;
 
-  void initPushwalls(Matrix<int> wallGrid, Matrix<int> objectGrid) {
+  void initPushwalls(Sprite wallGrid, Sprite objectGrid) {
     pushwalls.clear();
     activePushwall = null;
 
@@ -32,7 +32,7 @@ class PushwallManager {
     }
   }
 
-  void update(Duration elapsed, Matrix<int> wallGrid) {
+  void update(Duration elapsed, Sprite wallGrid) {
     if (activePushwall == null) return;
     final pw = activePushwall!;
 
@@ -85,7 +85,7 @@ class PushwallManager {
     double playerX,
     double playerY,
     double playerAngle,
-    Matrix<int> wallGrid,
+    Sprite wallGrid,
   ) {
     // Only one pushwall can move at a time in the original engine!
     if (activePushwall != null) return;