Added 5 new methods to the export preview UI:
chart.pdfPreviewUI.selectPage(index: number) : void; chart.pdfPreviewUI.removePage(index: number) : void; chart.pdfPreviewUI.toggelePrintTreeOrProfile() : void; chart.pdfPreviewUI.toggleLanscape(): void; chart.pdfPreviewUI.addPage(page: OrgChart.exportPDFPage) : void;
