added new mode SVG

This mode generates an SVG image an inlines it. This is much easier to
read than the obfuscated image but should still be relatively hard for
most spammers (until they start handl

added new mode SVG

This mode generates an SVG image an inlines it. This is much easier to
read than the obfuscated image but should still be relatively hard for
most spammers (until they start handling inline SVGs).

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made fonts easily exchangable