Add a 'Stamp' widget.

Place one or multiple stamps on scanned pages in defined locations.

A stamp is understood here as
 - a transparent text in a transparent frame with no borders
 - an opaque text on an opaque background with no borders.

Stamp parameters:
 - text
 - font
 - foreground colour
 - background colour
 - angle of rotation
 - transparency.

Locations:
 - centre
 - cardinal directions
 - inter-cardinal directions.

Resources/InsaneWidget/XScannerWidget.h

@@ -16,7 +16,6 @@
 #include <ScannerWidget.h>
 #include "TimeredStatusBar.h"
 #include "InsaneWorker.h"
-#include "Common.h"
 #include <map>
 
 class BackgroundScannerDiscoveryEvent;
@@ -33,6 +32,7 @@ class BackgroundScannerDiscoveryEvent;
 
 class XScannerWidget : public ScannerWidget
 {
+  DECLARE_DYNAMIC_CLASS( XScannerWidget )
   friend class BackgroundScannerDiscovery;
 public:
   XScannerWidget() {};