implemented light into cpp,

bug:
everything is dark,
need to calculate the normal matrix once in cpp and not for every pixel

QtMeshViewer/Header/OglViewerWidget.h

@@ -37,6 +37,11 @@ private:
 		bool z = true;
 	} m_rotDirections;
 
+	struct {
+		QVector3D position = { 1,1,1 };
+		QVector3D intensities = { 1,1,1 };
+	} m_light;
+
 	QOpenGLShaderProgram m_program;
 	GeometryEngine *m_dataEngine;