de-normalize item by name data. create counts during library scan for fast access.

MediaBrowser.Controller/Entities/IItemByName.cs

@@ -1,4 +1,7 @@
-
+using MediaBrowser.Model.Dto;
+using System;
+using System.Collections.Generic;
+
 namespace MediaBrowser.Controller.Entities
 {
     /// <summary>
@@ -6,5 +9,8 @@ namespace MediaBrowser.Controller.Entities
     /// </summary>
     public interface IItemByName
     {
+        ItemByNameCounts ItemCounts { get; set; }
+
+        Dictionary<Guid, ItemByNameCounts> UserItemCounts { get; set; }
     }
 }