Update item filenames.
drwxr-xr-x - chrome
drwxr-xr-x - contest-types
drwxr-xr-x - damage-classes
drwxr-xr-x - fonts
drwxr-xr-x - habitats
drwxr-xr-x - item-pockets
drwxr-xr-x - items
drwxr-xr-x - pokemon
drwxr-xr-x - ribbons
drwxr-xr-x - shapes
drwxr-xr-x - types
drwxr-xr-x - warriors