[NTG-context] Set: The Card Game

Hi, Another ConTeXt example. https://bitbucket.org/djarvis/salish-card-set/src/ Included is a script (svg2mp.sh) that converts SVG files into MetaPost code. This allows for editing the image shapes in Inkscape (or similar) then manipulating them in MetaPost. This example code produces a thematic variation on Set. There are a few unsightly hacks, and some duplicated code that could be eliminated. Improvements and general comments are welcome.