+ Removed a spurious '\n' from an ee_putstr().
  * src/starfield.c:
    + Fixed starfield color.
  * data/:
    + Fixed every sprite's colors.

+ More robust sprite loader.
    + Added ee_set_sprite_frame() and ee_get_sprite_frame().
    + Free all structures in ee_free_sprite().
  * src/aliens.c src/bonus.c:
    + Use ee_draw_sprite() instead of our manual sprite rendering.
  * src/box.c:
    + Use ee_draw_line() instead of the manual equivalent.
  * data/:
    + Added foo_fighter, baz_fighter, item_gem and item_heart sprites.