fixes #555 - Have clients report seek and queuing capabilities

MediaBrowser.Model/ApiClient/IApiClient.cs

@@ -497,9 +497,11 @@ namespace MediaBrowser.Model.ApiClient
         /// </summary>
         /// <param name="itemId">The item id.</param>
         /// <param name="userId">The user id.</param>
+        /// <param name="isSeekable">if set to <c>true</c> [is seekable].</param>
+        /// <param name="queueableMediaTypes">The list of media types that the client is capable of queuing onto the playlist. See MediaType class.</param>
         /// <returns>Task{UserItemDataDto}.</returns>
         /// <exception cref="ArgumentNullException">itemId</exception>
-        Task ReportPlaybackStartAsync(string itemId, string userId);
+        Task ReportPlaybackStartAsync(string itemId, string userId, bool isSeekable, List<string> queueableMediaTypes);
 
         /// <summary>
         /// Reports playback progress to the server

MediaBrowser.Model/Session/SessionInfoDto.cs

@@ -1,11 +1,24 @@
-using System.ComponentModel;
-using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Entities;
 using System;
+using System.Collections.Generic;
+using System.ComponentModel;
 
 namespace MediaBrowser.Model.Session
 {
     public class SessionInfoDto : INotifyPropertyChanged
     {
+        /// <summary>
+        /// Gets or sets a value indicating whether this instance can seek.
+        /// </summary>
+        /// <value><c>true</c> if this instance can seek; otherwise, <c>false</c>.</value>
+        public bool CanSeek { get; set; }
+
+        /// <summary>
+        /// Gets or sets the queueable media types.
+        /// </summary>
+        /// <value>The queueable media types.</value>
+        public List<string> QueueableMediaTypes { get; set; }
+        
         /// <summary>
         /// Gets or sets the id.
         /// </summary>