Rewrite and simplify Inventory Menu, various fixes for item effects

Zennysoft.Game.Ma.Implementation/Components/IEquipmentComponent.cs

@@ -1,4 +1,5 @@
 using Chickensoft.Collections;
+using Godot;
 using Zennysoft.Ma.Adapter.Entity;
 
 namespace Zennysoft.Ma.Adapter;
@@ -28,4 +29,5 @@ public interface IEquipmentComponent : IEntityComponent
 
   public ElementalResistanceSet ElementalResistance { get; }
 
+  public event Action<EquipableItem> EquipmentChanged;
 }