Use fa icons on edit and download links
use FA icons for download and edit
Better more inkscape-friendly base template
Better initialization for new InkscapeSlides

We now initialize new inkscape slides with the simple slide template, as that template is now 100% inkscape-compatible.
Work around for different line heights and inkscape

We want completely empty lines to be 0.2em high, inkscape ignores the row height unless there is actual text in the row, so we need to add a transparent letter there...