A very simple, no-dependencies drawing API providing some primitive operations including lines, rectangles,
circles, ellipses, arcs. It doesn't actually draw TO anything, you must provide your own implementation
of Backing to actually paint the pixels. This project is intended for use with Snake, my
project for Razer devices on Linux, but is made available in case others may find it useful. It
doesn't have anything fancy like anti-alias, transformations or even line widths, contributions
welcome though!