Added nameless' sprites

SHODAN, girl, boy, clover and Yotsuba holograms; girl, boy, malf
versions of those and 4chan AI cores.
http://vg13.undo.it/forum/viewtopic.php?f=9&t=504
All available malf/static/error versions of the cores are available as a choice rather than being forced upon the player, for the reason Hoshi said.
Those are just esthetic/roleplaying tools and can't be used to know if the AI is malf or not for sure.