Redesign and reimplement inventory menu

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

Zennysoft.Game.Ma/src/items/jewels/Jewel.cs

@@ -0,0 +1,37 @@
+using Chickensoft.AutoInject;
+using Chickensoft.Introspection;
+using Chickensoft.Serialization;
+using Godot;
+using Zennysoft.Game.Ma;
+using Zennysoft.Ma.Adapter;
+
+[Meta(typeof(IAutoNode)), Id("jewel")]
+public partial class Jewel : InventoryItem
+{
+  public override void _Notification(int what) => this.Notify(what);
+
+  [Node] private Sprite3D _sprite { get; set; }
+
+  public void OnReady()
+  {
+    _sprite.Texture = Stats.Texture;
+  }
+
+  public override string ItemName => Stats.Name;
+
+  public override string Description => Stats.Description;
+
+  public override float SpawnRate => Stats.SpawnRate;
+
+  public override int ThrowDamage => Stats.ThrowDamage;
+
+  public override float ThrowSpeed => Stats.ThrowSpeed;
+
+  public override ItemTag ItemTag => Stats.ItemTag;
+
+  public override Texture2D GetTexture() => Stats.Texture;
+
+  [Export]
+  [Save("jewel_stats")]
+  public JewelStats Stats { get; set; } = new JewelStats();
+}