+ 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.


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/ttyvaders/trunk@122 92316355-f0b4-4df1-b90c-862c8a59935f