sendMessage via signal plot from file to window,

add severity to messages (black, yellow, red),
add about text,
removed unused texture from resource

QtMeshViewer/Header/GeometryEngine.h

@@ -19,7 +19,7 @@ class GeometryEngine : public QObject, protected QOpenGLFunctions
 	Q_OBJECT
 
 public:
-	GeometryEngine();
+	GeometryEngine(QObject *parent = Q_NULLPTR);
 	virtual ~GeometryEngine();
 
 private:
@@ -38,6 +38,7 @@ public slots:
 
 signals:
 	void requestResetView();
-
+	void sendMessage(QString message, int severity);
+	void requestUpdate();
 };