Gui: GestureNavigationStyle rewrite

to better work on Qt5
+ new (dormant) feature: button roll gestures

src/Gui/SoFCDB.cpp

@@ -59,6 +59,7 @@
 
 #include "propertyeditor/PropertyItem.h"
 #include "NavigationStyle.h"
+#include "GestureNavigationStyle.h"
 #include "Flag.h"
 #include "SelectionObject.h"