Add missing icon sizes

[leoheitmannruiz]

If Firefox doesn't encounter the icon size it expects, it fetches the icon from addons.mozilla.org.

This is especially annoying on a slow connection or when not connected at all. But generally, I'd just rather have it not download the icon.

This should add all sizes.

magick icon128.png -resize 16x16 icon16.png
magick icon128.png -resize 32x32 icon32.png
magick icon128.png -resize 64x64 icon64.png
magick icon128.png -resize 96x96 icon96.png

zopflipng -y icon16.png icon16.png
zopflipng -y icon32.png icon32.png
zopflipng -y icon64.png icon64.png
zopflipng -y icon96.png icon96.png