+ Replaced ee_color_names[] with ee_get_color_name().
    + Don't oversleep in ee_refresh().
  * libee/graphics.c:
    + Implemented ee_printf().
  * test/demo.c:
    + If new keypresses are detected, don't wait for the next screen refresh.
    + Added an fps counter on demos.
    + Added controls for outlines and drawing boundaries.