Overhaul item and inventory and clean up bits and pieces

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

@@ -0,0 +1,14 @@
+using Zennysoft.Ma.Adapter.Entity;
+
+public interface IEquipableItem : IBaseInventoryItem
+{
+  public int BonusAttack { get; }
+  public int BonusDefense { get; }
+  public int BonusHP { get; }
+  public int BonusVT { get; }
+  public int BonusLuck { get; }
+
+  public bool Glued { get; set; }
+
+  public ElementalResistanceSet ElementalResistance { get; }
+}