Draft: split svg.get_text into smaller readable functions
Draft: split svg.get_text into smaller readable functions

Split the code for SVG string that will be displayed
for TechDraw pages; also split the header for other cases.

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master