Redesign and reimplement inventory menu

Add jewels but no implementation yet (needed redesign of inventory menu to function correctly)

Zennysoft.Game.Ma/src/items/ammo/Ammo.cs

@@ -1,8 +1,9 @@
 using Chickensoft.AutoInject;
+using Chickensoft.Collections;
 using Chickensoft.Introspection;
 using Chickensoft.Serialization;
 using Godot;
-using Zennysoft.Game.Abstractions;
+using Zennysoft.Game.Implementation;
 using Zennysoft.Game.Ma;
 using Zennysoft.Ma.Adapter;
 
@@ -11,13 +12,11 @@ public partial class Ammo : EquipableItem, IStackable
 {
   public override void _Notification(int what) => this.Notify(what);
 
-  private int _count;
-
   [Node] private Sprite3D _sprite { get; set; }
 
   public void OnReady()
   {
-    _count = Stats.InitialCount;
+    Count = new AutoProp<int>(Stats.InitialCount);
     _sprite.Texture = Stats.Texture;
   }
 
@@ -37,8 +36,9 @@ public partial class Ammo : EquipableItem, IStackable
   public override Texture2D GetTexture() => Stats.Texture;
 
   [Save("ammo_item_count")]
-  public int Count { get => _count; }
-  public void SetCount(int count) => _count = count;
+  public AutoProp<int> Count { get; private set; }
+
+  public void SetCount(int count) => Count.OnNext(count);
 
   [Save("ammo_element")]
   public ElementType AmmoElement => Stats.AmmoElement;