Added configurable weapons.

AlientAttack.MonoGame/Things/Items/Item.cs

@@ -4,7 +4,7 @@ using System;
 
 namespace AlienAttack.MonoGame.Things.Items;
 
-internal abstract class Item : MoveableSprite
+public abstract class Item : MoveableSprite
 {
     private Vector2 _anchor;        // the "center" the item orbits around
     private float _t;               // radians
@@ -59,13 +59,10 @@ internal abstract class Item : MoveableSprite
 
     public override void OnCollision(SpriteCollisionContext context)
     {
-        if (context.Sprite is Player player)
+        if (context.Sprite is Player)
         {
             IsDead = true;
-            ApplyEffect(player);
             context.AudioManager.PlayPickup(Kind);
         }
     }
-
-    protected abstract void ApplyEffect(Player player);
 }