Add stupid PNG support

It's stupid because:
 - it's fixed to output 128x128 png images (think preview icons)
 - it doesn't actually draw lines, it just does them as dots at the endpoints
but it does kind of work.
3 files changed
tree: 33e0c0d6007a49311bed4fd79b3ec68f15e91a17
  1. .gitignore
  2. Makefile
  3. pes.c
  4. pes.h
  5. png.c
  6. svg.c