support delete per library

MediaBrowser.Model/Tasks/ITaskManager.cs

@@ -74,5 +74,7 @@ namespace MediaBrowser.Model.Tasks
         
         event EventHandler<GenericEventArgs<IScheduledTaskWorker>> TaskExecuting;
         event EventHandler<TaskCompletionEventArgs> TaskCompleted;
+
+        void RunTaskOnNextStartup(string key);
     }
 }

MediaBrowser.Model/Users/UserPolicy.cs

@@ -44,6 +44,7 @@ namespace MediaBrowser.Model.Users
         public bool EnablePlaybackRemuxing { get; set; }
 
         public bool EnableContentDeletion { get; set; }
+        public string[] EnableContentDeletionFromFolders { get; set; }
         public bool EnableContentDownloading { get; set; }
 
         /// <summary>
@@ -73,6 +74,7 @@ namespace MediaBrowser.Model.Users
         public UserPolicy()
         {
             EnableContentDeletion = true;
+            EnableContentDeletionFromFolders = new string[] { };
 
             EnableSyncTranscoding = true;