Fix playlist creation and removal

MediaBrowser.Controller/Playlists/IPlaylistManager.cs

@@ -56,5 +56,13 @@ namespace MediaBrowser.Controller.Playlists
         /// <param name="newIndex">The new index.</param>
         /// <returns>Task.</returns>
         Task MoveItemAsync(string playlistId, string entryId, int newIndex);
+
+        /// <summary>
+        /// Removed all playlists of a user.
+        /// If the playlist is shared, ownership is transferred.
+        /// </summary>
+        /// <param name="userId">The user id.</param>
+        /// <returns>Task.</returns>
+        Task RemovePlaylists(Guid userId);
     }
 }

MediaBrowser.Controller/Playlists/Playlist.cs

@@ -15,6 +15,7 @@ using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.Querying;
 
 namespace MediaBrowser.Controller.Playlists