Hide some property setters, init null values, update namespaces

MediaBrowser.Model/SyncPlay/GroupQueueMode.cs

@@ -0,0 +1,18 @@
+namespace MediaBrowser.Model.SyncPlay
+{
+    /// <summary>
+    /// Enum GroupQueueMode.
+    /// </summary>
+    public enum GroupQueueMode
+    {
+        /// <summary>
+        /// Insert items at the end of the queue.
+        /// </summary>
+        Queue = 0,
+
+        /// <summary>
+        /// Insert items after the currently playing item.
+        /// </summary>
+        QueueNext = 1
+    }
+}