The new icon was way back in ad4a3ab2ff
Two years ago! But since I was redoing the logo for Malamar Showdown,
I figured I'd spruce up the regular logo, too.
The main change is just the color scheme, and the exclamation mark
being rounded. The shadows have also been tightened up. There's a lot
of pixel-perfect tweaking going on, too, with the hole in the "e",
and also some of that tweaking in "ET" in "BETA", too.
(Oh, also, so ends Malamar Showdown. o7 You'll always be _my_ friend,
Malamar!)
This commit adds high-resolution versions of the favicon into
favicon-notify.ico (and the source of those versions to graphics-src/).
In addition, it updates favicon-*.png, and moves some unused icon files
into graphics-src/old/.
