Improved weapon switching

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

lib/features/weapon/weapon.dart

@@ -1,7 +1,9 @@
 enum WeaponState { idle, firing }
 
+enum WeaponType { knife, pistol, machineGun, chainGun }
+
 abstract class Weapon {
-  final String name;
+  final WeaponType type;
   final int idleSprite;
   final List<int> fireFrames;
   final int damage;
@@ -12,7 +14,7 @@ abstract class Weapon {
   int lastFrameTime = 0;
 
   Weapon({
-    required this.name,
+    required this.type,
     required this.idleSprite,
     required this.fireFrames,
     required this.damage,