* AssemblyInfo.cs.in : add IgnoreClassInitializers attr to all.
* generator/ObjectGen.cs : add custom-attr generation for objects.
* glib/ClassInitializerAttribute.cs : obsolete
* glib/IgnoreClassInitializersAttribute.cs : new assembly attr
to avoid a blind GetMethods reflection.
* glib/Makefile.am : add files
* glib/TypeInitializerAttribute.cs : new attr to specify init
method to be run at type registration.
* gtk/Widget.custom : remove the ClassInitializerAttr.
* gtk/Gtk.metadata : add a custom-attr node to GtkWidget.
* sample/Subclass.cs : use the IgnoreClassInitializers attr.
svn path=/trunk/gtk-sharp/; revision=85480
