Add SVG multi export

Add a second SVG export option that allows for exporting
a series of icons of various size in one go. A dialog is shown
that allows for entering a file name pattern with place holders
and a list of sizes.

Change-Id: Ic644a9d402aa44af5899c29cf83051fdd7bba3d1
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Diana de Sousa <diana.desousa@theqtcompany.com>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/imageviewer/exportdialog.cpp

@@ -24,6 +24,7 @@
 ****************************************************************************/
 
 #include "exportdialog.h"
+#include "imageview.h" // ExportData
 
 #include <coreplugin/coreicons.h>
 
@@ -56,7 +57,7 @@ namespace Internal {
 
 enum { exportMinimumSize = 1, exportMaximumSize = 2000 };
 
-static QString imageNameFilterString()
+QString ExportDialog::imageNameFilterString()
 {
     static QString result;
     if (result.isEmpty()) {
@@ -198,5 +199,10 @@ void ExportDialog::setExportFileName(const QString &f)
     m_pathChooser->setFileName(Utils::FileName::fromString(f));
 }
 
+ExportData ExportDialog::exportData() const
+{
+    return {exportFileName(), exportSize()};
+}
+
 } // namespace Internal
 } // namespace ImageViewer