[UI idea] generate vector in addition to dst for turtle graphics

[Felienne]

Idea incl level We now generate a dst file for embroidery machines, but if we want to run the drawing on a pen plotter we have to convert it to a vector. This is not a real problem (I do it now with https://stitchpad.io/ manually) but it would be easier if we generate both files at once so teachers don't have to convert.