* glib/MainContext.cs: beginning of MainContext class, just
Iteration and Pending methods to be able to refresh Gtk in the
middle of time consuming function where it's not worth while to
use threads
* glue/style.c (gtksharp_gtk_style_get_font_description): new
function to access style's font_description field
* gtk/Style.custom: added font description property
svn path=/trunk/gtk-sharp/; revision=11358
