private File getLastExportDirectory() {
		String lastDirStr = Preferences.getProperty(Preferences.LAST_EXPORT_DIRECTORY,
			System.getProperty("user.home"), true);
		return new File(lastDirStr);
	}
Construct a new ExporterDialog for exporting a program, optionally only exported a
selected region.

@param graph the graph to save
@param exporters the list of known exporters
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/export/GraphExporterDialog.java