Updated GraphicalMenu subproject in wiki.

[Vesa Jääskeläinen]

Hi,

While I was traveling I wrote some thoughs about graphical menu. So if
you have any thoughs about it I would like that you check out it and
comment it in here.

http://grub.enbug.org/Subprojects/GraphicalMenu

I don't know when I have next time free time to work on it so please be
free to discuss or event start to implement it :) There are still things
missing but I think it has good base to continue on.

Thanks,
Vesa Jääskeläinen