revert missing session fields

Emby.Server.Implementations/Session/SessionManager.cs

@@ -502,7 +502,8 @@ namespace Emby.Server.Implementations.Session
                 Client = appName,
                 DeviceId = deviceId,
                 ApplicationVersion = appVersion,
-                Id = key.GetMD5().ToString("N", CultureInfo.InvariantCulture)
+                Id = key.GetMD5().ToString("N", CultureInfo.InvariantCulture),
+                ServerId = _appHost.SystemId
             };
 
             var username = user?.Username;

MediaBrowser.Controller/Session/SessionInfo.cs

@@ -108,6 +108,12 @@ namespace MediaBrowser.Controller.Session
         /// <value>The name of the device.</value>
         public string DeviceName { get; set; }
 
+        /// <summary>
+        /// Gets or sets the type of the device.
+        /// </summary>
+        /// <value>The type of the device.</value>
+        public string DeviceType { get; set; }
+
         /// <summary>
         /// Gets or sets the now playing item.
         /// </summary>
@@ -215,8 +221,17 @@ namespace MediaBrowser.Controller.Session
 
         public string PlaylistItemId { get; set; }
 
+        public string ServerId { get; set; }
+
         public string UserPrimaryImageTag { get; set; }
 
+        /// <summary>
+        /// Gets or sets the supported commands.
+        /// </summary>
+        /// <value>The supported commands.</value>
+        public string[] SupportedCommands
+            => Capabilities == null ? Array.Empty<string>() : Capabilities.SupportedCommands;
+
         public Tuple<ISessionController, bool> EnsureController<T>(Func<SessionInfo, ISessionController> factory)
         {
             var controllers = SessionControllers.ToList();