* makefile : Add the codegen directory
* codegen/defs-parse.pl : Moved here from topdir and updated to parse
the new defs format for enums and flags.
* codegen/gtk-types.defs : Borrowed from pygtk.
* codegen/makefile : new
* gtk/makefile : remove generation step.
* gtk/gtk.defs : removed, now in codegen dir.
svn path=/trunk/gtk-sharp/; revision=1139
