* Makefile.am: reenable samples.
* sample/Actions.cs: s/Item/MenuItem, Item is dead.
* sample/NativeInstantiationTest.cs: fix dllimport, still crashes.
* sample/PolarFixed.cs: Fix size negotiation API usage, still crashes.
* sample/TreeModelDemo.cs: add ItemPrevious, still crashes.
* sample/Makefile.am: comment out some samples that don't build.
and unmanaged interface declarations.
(Implements): check recursively
* generator/ObjectGen.cs (Generate): output managed interfaces
* gtk/Gtk.metadata: make Container implement IEnumerable
* gtk/Container.custom (GetEnumerator): implement (a simplified
form of Children).
(AllChildren): add this (which accumulates the results of
Forall()).
(ForAll): mark ForAll(bool,CallbackInvoker) obsolete and add a
ForAll(bool,Gtk.Callback) overload to replace it.
* sample/PolarFixed.cs: new silly but fully-functional demo of
how to subclass container.
* sample/CustomNotebook.cs: kill this, since it was really
complicated, and never fully functional.
* sample/GtkDemo/DemoImages.cs (ToggleSensitivity): Use foreach
directly on the container, rather than on its .Children.
svn path=/trunk/gtk-sharp/; revision=42805
