add wireframe paint option,

write file information on the screen,
bug fixes

QtMeshViewer/Header/OglViewerWidget.h

@@ -44,6 +44,8 @@ private:
 	QVector3D m_translation;
 	QQuaternion m_rotation;
 
+	bool m_wireframe = false;
+
 protected:
 	void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
 	void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
@@ -66,5 +68,6 @@ private slots:
 
 public slots:
 	void changeDirection(int direction);
+	void toggleWireframe();
 };