Added simple hud overlay on double-click actions

MacPass/MPOverlayWindowController.h

@@ -0,0 +1,20 @@
+//
+//  MPOverlayWindowController.h
+//  MacPass
+//
+//  Created by Michael Starke on 03.03.13.
+//  Copyright (c) 2013 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+@interface MPOverlayWindowController : NSWindowController
+
++ (MPOverlayWindowController *)sharedController;
+
+/*
+ Displays an overlay centered at the given view. The Windows is added as a childwindow to the view window
+ */
+- (void)displayOverlayImage:(NSImage *)imageOrNil label:(NSString *)labelOrNil atView:(NSView *)view;
+
+@end