This uses the github.com:googlei18n/region-flags and imagemagick to generate 27x27 flag pngs. The flags have a 1px #e0e0e0 border and transparent padding such that each flag is of the same height (17px including the border).
Also add script for generating the PNGs and add pre-rendered PNGs
for the Linux electron build which means you don't need icns2png
to build it and the Linux icons are straight from the SVG rather
than resized bitmaps.