add movie prefix feature

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -2134,7 +2134,7 @@ namespace MediaBrowser.Controller.Entities
             {
                 MetadataCountryCode = GetPreferredMetadataCountryCode(),
                 MetadataLanguage = GetPreferredMetadataLanguage(),
-                Name = Name,
+                Name = GetNameForMetadataLookup(),
                 ProviderIds = ProviderIds,
                 IndexNumber = IndexNumber,
                 ParentIndexNumber = ParentIndexNumber,
@@ -2143,6 +2143,11 @@ namespace MediaBrowser.Controller.Entities
             };
         }
 
+        protected virtual string GetNameForMetadataLookup()
+        {
+            return Name;
+        }
+
         /// <summary>
         /// This is called before any metadata refresh and returns true or false indicating if changes were made
         /// </summary>