ARPG-customize the avatar

#tutorial The "customize the avatar" (this module is not built on "basic elements", so it's simply to recycle).

A little note: this is only an interface, you need to use some server-side software to save the players choices (eg. ImageMagik to merge the spritesheets and to apply a color filter).
Credits for the used graphis, as usual, are in the script's comments.