PartDesign: Refactor pattern features and gui

- remove StdDirection,StdAxis and StdMirrorPlane properties
- support sketch H_Axis, V_Axis, N_axis as valid references in patterns
- polish reference selection gui (unified for standard axes and custom references)

src/Mod/PartDesign/Gui/TaskLinearPatternParameters.h

@@ -56,21 +56,16 @@ public:
     TaskLinearPatternParameters(TaskMultiTransformParameters *parentTask, QLayout *layout);
     virtual ~TaskLinearPatternParameters();
 
-    const std::string getStdDirection(void) const;
     const std::string getDirection(void) const;
     const bool getReverse(void) const;
     const double getLength(void) const;
     const unsigned getOccurrences(void) const;
 
 private Q_SLOTS:
-    void onStdDirection(const std::string& dir);
-    //void onButtonX();
-    //void onButtonY();
-    //void onButtonZ();
+    void onDirectionChanged(int num);
     void onCheckReverse(const bool on);
     void onLength(const double l);
     void onOccurrences(const int n);
-    void onButtonReference(const bool checked);
     virtual void onUpdateView(bool);
 
 protected: