Fixed the hell out of all remaining form problems.

Fixed the hell out of all remaining form problems.

Every flavor page should work with no missing sprites.  Save perhaps for
Unown, because I honestly don't have them.

Every sprite exists as ###-form.png.  There is also still a ###.png,
containing a reasonable default form, so people who don't give a crap
about this mess can just use the numbered sprites.  Beta forms should
now all be ###-beta.png.

Form groups now have a notion of "in-battle", which is used to hide
overworld sprites when appropriate.

Form sprites have a first-class sense of being a default or not, too.

Deoxys is...  well, let's not talk about Deoxys.  Deoxys is fixed.