Accessories

Fixed accessories becoming improperly detached when the host suit was clicked on. Renamed some procs to make it clearer who has the responsibility for attaching and removing accessories.

Also made accessories visible on the host clothing when attached, as an overlay, so now it is more obvious when a clothing item has an accessory attached.

![screenshot 2014-05-10 22 29 33](https://cloud.githubusercontent.com/assets/242428/2937618/2ace9cd8-d8bf-11e3-97d4-fe283f44bd1d.png)

I was originally planning to use the SOUTH direction of the icons/mob/ties.dmi image as the overlay, however this had problems with the fact that those images are directional. Rather than override Move()
in clothing/under, I thought it would be less hacky to read the just overlays from a separate .dmi, so the overlays are taken from icons/obj/clothing/ties_overlays.dmi, which right now is a copy of icons/mob/ties.dmi with all the sprites made non-directional.