Rip X/Y item icons.

Moved old icons to gen5/.

Note that we only get HM icons for normal, flying and water. We could
fake the other types by copying the palettes from the TM icons, but i'm
fine with this.

The Bicycle, Xtransceiver (and Dropped Item), and Holo Caster each come
in two different colors. The Common Stone, Shalour Sable, and Travel
Trunks are not yet in the db (they are unused). Gram 1 has an icon but
Gram 2 and Gram 3 do not so i copied 1's.

I didn't add Latiasite or Latiosite.