Mystery item implementation

Zennysoft.Game.Ma.Implementation/Item/EquipableItem.cs

@@ -6,8 +6,6 @@ namespace Zennysoft.Ma.Adapter;
 [Meta, Id("equipable_item")]
 public abstract partial class EquipableItem : InventoryItem
 {
-  public abstract ItemTag ItemTag { get; }
-
   [Save("equipable_item_is_equipped")]
   public bool IsEquipped { get; set; }
 }

Zennysoft.Game.Ma.Implementation/Item/IInventory.cs

@@ -6,6 +6,8 @@ public interface IInventory
 
   public bool TryAdd(InventoryItem inventoryItem);
 
+  public bool TryInsert(InventoryItem inventoryItem, int index);
+
   public void Remove(InventoryItem inventoryItem);
 
   public void Sort();

Zennysoft.Game.Ma.Implementation/Item/InventoryItem.cs

@@ -19,6 +19,8 @@ public abstract partial class InventoryItem : Node3D
   public abstract double ThrowDamage { get; }
   [Save("inventory_item_throw_speed")]
   public abstract float ThrowSpeed { get; }
+  [Save("inventory_item_tag")]
+  public abstract ItemTag ItemTag { get; }
 
   public abstract Texture2D GetTexture();
 }

Zennysoft.Game.Ma.Implementation/Item/Tags/ItemTag.cs

@@ -3,5 +3,6 @@
 public enum ItemTag
 {
   None,
-  BreaksOnChange
+  BreaksOnChange,
+  MysteryItem
 }