Add line width argument for SVG preview and export #840
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This PR implements a line width argument which allows the setting of the SVG line with independent of the burn parameter.
This was requested originally by #607 as the user there seems to use a laser engraving software which needs a line width of 0.001mm for burning but engraves thicker lines instead. The current implementation enforces a minimum of 0.05mm.
I also like to set the burn parameter to 0 and use LigthBurn's kerf offset setting instead, but find the 0.05mm minimum hard to view on the SVG preview. I therefore would also like to see such a parameter.
I implemented it in a way, that the value is an empty string by default and then follows the original value of min(2x burn, 0.05) making the change fully backward compatible.