Add loadNewPath function

mainwindow.h

@@ -22,7 +22,8 @@ public:
     void updatePathView();
     void updateStepView(size_t num);
     void onTextChanged();
-    void loadPath();
+    void loadNewPath();
+    void loadPath(Path* p);
     void addNewPath();
     void addNewStep();
     void exportHTMLMap();
@@ -43,6 +44,8 @@ private slots:
 
     void on_actionEditCut_triggered();
 
+    void on_pathNumber_valueChanged(int arg1);
+
 private:
     Ui::MainWindow *ui;
     QString currentFile;