Added more functionality to the demo (parallel zone outlines on both screens). The code is now pretty messy and ready for a rewrite; it's definitely just a pilot. The thing works, but only because of lots of try/catch things. Also tested the PPTX output from LibreOffice on the Windows VM, but it's horrible; that's not really an option. If we must use other people's hardware, we'll need to rework everything into PDFs that go point by point.