Make it possible to drag and drop multiple files

It is now possible to add multiple files before sending them to the processing queue.

main.go

@@ -46,7 +46,7 @@ func init() {
 		appMetadata,
 		localizerService,
 		queue,
-		kernel.NewQueueLayoutObject(queue, localizerService, ffplayService),
+		ffplayService,
 		convertorService,
 	)
 }
@@ -108,7 +108,12 @@ func main() {
 
 	localizerView := localizer.NewView(application)
 	convertorView := convertor.NewView(application)
-	convertorHandler := handler.NewConvertorHandler(application, convertorView, errorView, convertorRepository, settingDirectoryForSaving)
+	itemsToConvertService := kernel.NewItemsToConvert(
+		application.GetWindow().GetLayout().GetRightTabs().GetAddedFilesContainer(),
+		application.GetFFplayService(),
+		application.GetLocalizerService(),
+	)
+	convertorHandler := handler.NewConvertorHandler(application, convertorView, errorView, convertorRepository, settingDirectoryForSaving, itemsToConvertService)
 
 	themeRepository := theme.NewRepository(settingRepository)
 	themeService := theme.NewTheme(application, themeRepository)