Add support for exporting hyperlinks which are not valid URIs to PDF. Currently such hyperlink URIs are not exported to the PDF document.

Example of such hyperlink is "mailto:abc%20abc-abc-abc%20%3cabc@abc.com%3e" (mailto:abc abc-abc-abc <abc@abc.com>), but there could be more types. Currently the internal API relies on creating instance of the system Uri class, which is not possible in this case.