Added support for linked children

MediaBrowser.Controller/Entities/LinkedChild.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections;
+
+namespace MediaBrowser.Controller.Entities
+{
+    public class LinkedChild
+    {
+        public string Path { get; set; }
+        public LinkedChildType Type { get; set; }
+    }
+
+    public enum LinkedChildType
+    {
+        Manual = 1,
+        Shortcut = 2
+    }
+
+    public class LinkedChildComparer : IComparer
+    {
+        public int Compare(object x, object y)
+        {
+            var a = (LinkedChild)x;
+
+            var b = (LinkedChild)y;
+
+            if (!string.Equals(a.Path, b.Path, StringComparison.OrdinalIgnoreCase))
+            {
+                return string.Compare(a.Path, b.Path, StringComparison.OrdinalIgnoreCase);
+            }
+            if (a.Type != b.Type)
+            {
+                return a.Type.CompareTo(b.Type);
+            }
+
+            return 0;
+        }
+    }
+}