Added PasteboardController to handle pasteboard cleanup on shutdown and timeout

MacPass/MPPasteBoardController.h

@@ -0,0 +1,23 @@
+//
+//  MPPastBoardController.h
+//  MacPass
+//
+//  Created by Michael Starke on 02.03.13.
+//  Copyright (c) 2013 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface MPPasteBoardController : NSObject
+
+/*
+ This time sets the time interval after which a copied entry shoudl be purged from the pasteboard
+ */
+@property (assign, nonatomic) NSTimeInterval clearTimeout;
+@property (assign, nonatomic) BOOL clearPasteboardOnShutdown;
+
++ (MPPasteBoardController *)defaultController;
+
+- (void)copyObjects:(NSArray *)objects;
+
+@end