Add image preview

src/Tools/tim_tool/ui/app-window.slint

@@ -15,6 +15,7 @@ export component MainWindow inherits Window {
     // Convert Image values
     in-out property file_tab_browse_path          <=> file_tab.conv_image_path;
     in-out property file_tab_image_data           <=> file_tab.conv_image_data;
+    in-out property file_tab_image_name           <=> file_tab.conv_image_name;
     callback        file_tab_browse_convert_image <=> file_tab.conv_image_browse_clicked;
 
     title: "TIM Tool 0.1.0";