accessible login

Hey artists,

the new gdm has a nice and easy way to turn on HighContrast / LargePrint themes.
You can see screenshots of it here:

http://people.redhat.com/mclasen/hicontrast1.png
http://people.redhat.com/mclasen/hicontrast2.png

Unfortunately, as the screenshots show, a number of the icons that gdm
uses don't have
HighContrast versions, which makes the experience a bit less awesome
than it could be.

The list of required icons is fairly short, so it seems doable to
reach a 100% accessible login screen, as far as icons are concerned:

emblem-default
media-playback-pause
view-refresh
system-shutdown
preferences-desktop-accessibility (this may just need to be scaled down)
go-home
preferences-desktop-locale
preferences-desktop-keyboard
session-properties (not in the screenshots)


Matthias