Drag n drop (#223)

Added drop interface for image files, images, and text, dragged from other applications.  (#153,#223)

- Lock aspect ration on new image objects by default
- Communicate context menu click location to paste actions

model/Point.h

@@ -24,6 +24,8 @@
 
 #include "Distance.h"
 
+#include <QMetaType>
+
 
 namespace glabels
 {
@@ -52,4 +54,7 @@ namespace glabels
 }
 
 
+Q_DECLARE_METATYPE( glabels::model::Point )
+
+
 #endif // model_Point_h