Fixed a bug related to image loading (would only accept jpeg), added the QR Code example pattern

src/interface.cpp

@@ -469,7 +469,7 @@ static unsigned closest_state(const Alphabet& alph, const QColor& color)
 
 void MainWindow::load_from_image()
 {
-    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),"",tr("Image (*.png *.jpg *.jpeg *.bmp *.gif"));
+    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),"",tr("Image (*.png *.jpg *.jpeg *.bmp *.gif)"));
     QImage img(fileName);
     if (img.isNull())
         return;