- Random supersampling (prettier but quite slow)
- WIP: bette color gradient

- All the pixels are stored in an array, put in a surface then a texture
  so we don't draw each pixel one by one.
- The computation of this array is done in parallel (one thread by line)
- Use sscanf instead of atoi hack to parse options

A Config struct and more getopt options for window size, real/imag
range, center position.

Zooming and moving is proportionnal to the range we are viewing,
feels more natural than incrementing by a constant value.

Loop throught each pixel and color it black if its in the set,
white otherwise.
This is eavily inspired by the coding train video on the subject.
(https://www.youtube.com/watch?v=6z7GQewK-Ks)

init, quit and run functions.
Error handling.