+ Renamed ee_color() to ee_set_color(), wrote ee_get_color().
  * libee/line.c:
    + Implemented draw_polyline() and draw_thin_polyline().
  * libee/sprite.c:
    + Removed the f member of struct ee_sprite.
    + Implemented ee_get_sprite_{width|height|dx|dy}().
    + Restore the color fater ee_draw_sprite() is called.
  * libee/box.c:
    + Fixed a bug causing improper box clipping at the right and the bottom.
  * data/foo_fighter:
    + Fixed bugs in the sprite.
  * src/intro.c:
    + Test effects for the future game's intro.
  * test/spritedit.c:
    + Added stuff to the sprite editor. We can now navigate through frames.

+ Wrote ee_draw_triangle() and ee_draw_thin_triangle().
  * libee/box.c:
    + Wrote ee_draw_box(), ee_draw_thin_box() and ee_fill_box().
  * libee/conic.c:
    + Wrote ee_fill_ellipse().
    + First attempt at ee_draw_thin_ellipse(), to be reworked.
  * test/demo.c:
    + Merged demo_lines() and demo_thin_lines().
    + Merged demo_triangles() and demo_outlined_triangles().
    + Wrote demo_box().
    + Use ee_fill_ellipse() in demo_all().