added two more svg modes that have no transparency and suitable for tee-shirt printing#77

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sballe73 wants to merge 7 commits intofukuchi:masterfrom

sballe73:master

Commits on Sep 24, 2015

added a fancy svg mode that does as described in https://github.com/fukuchi/libqrencode/issues/69
sballe73
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Commits on Oct 22, 2015

added two more svg modes that have no transparency and suitable for teeshirt printing
sballe73
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Commits on Aug 9, 2023

aligned with upstream
sballe73
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