added icon for PlatformUnitGuiPlugin

source/RobotAPI/gui_plugins/PlatformUnitPlugin/PlatformUnitGuiPlugin.h

@@ -102,10 +102,8 @@ namespace armarx
         void reportPlatformVelocity(::Ice::Float currentPlatformVelocityX, ::Ice::Float currentPlatformVelocityY, ::Ice::Float currentPlatformVelocityRotation, const Ice::Current& c = ::Ice::Current());
 
         // inherited of ArmarXWidget
-        virtual QString getWidgetName() const
-        {
-            return "RobotControl.PlatformUnitGUI";
-        }
+        virtual QString getWidgetName() const { return "RobotControl.PlatformUnitGUI"; }
+        virtual QIcon getWidgetIcon() const { return QIcon("://icons/retro_joystick2.svg"); }
 
         QPointer<QDialog> getConfigDialog(QWidget* parent = 0);
         virtual void loadSettings(QSettings * settings);