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fixes#4087
Missing "break" in loop after finding the extension was causing segfault because of null pointer access, as the unique pointer had been std:move-d when found and was thus no longer valid.
while fixing a SVG export issue for techDraw I noticed that some SVG files have program-dependent (and thus not clean) code in it. These are traces of the programs Sodipodi and Inkscape, like e.g. this line:
inkscape:export-filename="/home/yorik/PartDesign_Groove.png
This is unnecessary and FC should not use program-dependent code in the SVG but use instead plain SVG strictly following the SVG specification.
This PR transforms the few affected SVGs to a plain version.