[gtkada] Set_Foreground

[Emmanuel Briot]

> For the foreground? I thought it only applied for the background. Anyway
> I think it is easier an better to just use the Pango markup if it is
> only the foreground that is being changed.

Right, this is only for the background.
Also, as a general note we have found not a good idea to use color
names, portability-wise. Much better to specify colors as #FF0000 for
red.

Emmanuel