* generator/Signal.cs : rmv Handle param to SignalCallback ctor calls.
s/GtkSharp.Signal*/GLib.Signal*.
* generator/SignalHandler.cs : rmv Handle param to ctors as it's
redundant. s/GtkSharp.Signal*/GLib.Signal*. Use new Connect/Disconnect
instead of generating DllImports into libgobject directly.
* glib/SignalArgs.cs : move the the GLib namespace.
* glib/SignalCallback.cs : expose Connect and Disconnect methods to
hide some pinvokes that were previously generated. Also move to the
GLib namespace.
gnome/*Handler.cs : update to new SignalHandler API.
gnome/CanvasProxy.cs : ditto
gnome/void*Signal.cs : ditto
svn path=/trunk/gtk-sharp/; revision=26778