Overhaul item and inventory and clean up bits and pieces

Zennysoft.Game.Ma/src/map/IMap.cs

@@ -20,6 +20,10 @@ public interface IMap : INode3D
 
   void InitializeMapData();
 
+  public void FadeIn();
+
+  public void FadeOut();
+
   public AutoProp<int> CurrentFloorNumber { get; }
 
   public event Action<(Vector3 Rotation, Vector3 Position)> SpawnPointCreated;