Add shareware support and spawn correctly for difficulty levels

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

lib/features/map/wolf_map.dart

@@ -18,14 +18,18 @@ class WolfMap {
   );
 
   /// Asynchronously loads the map files and parses them into a new WolfMap instance.
-  static Future<WolfMap> loadDemo() async {
+  static Future<WolfMap> loadShareware() async {
     // 1. Load the binary data
     final mapHead = await rootBundle.load("assets/MAPHEAD.WL1");
     final gameMaps = await rootBundle.load("assets/GAMEMAPS.WL1");
     final vswap = await rootBundle.load("assets/VSWAP.WL1");
 
     // 2. Parse the data using the parser we just built
-    final parsedLevels = WolfMapParser.parseMaps(mapHead, gameMaps);
+    final parsedLevels = WolfMapParser.parseMaps(
+      mapHead,
+      gameMaps,
+      isShareware: true,
+    );
     final parsedTextures = VswapParser.parseWalls(vswap);
     final parsedSprites = VswapParser.parseSprites(vswap);
 
@@ -38,7 +42,7 @@ class WolfMap {
   }
 
   /// Asynchronously loads the map files and parses them into a new WolfMap instance.
-  static Future<WolfMap> load() async {
+  static Future<WolfMap> loadRetail() async {
     // 1. Load the binary data
     final mapHead = await rootBundle.load("assets/MAPHEAD.WL6");
     final gameMaps = await rootBundle.load("assets/GAMEMAPS.WL6");