Move wholly deprecated classes to gtk/deprecated/

We've recently a number of classes wholly. For these cases,
move the headers and sources to gtk/deprecated/ and adjust
Makefiles and includes accordingly.

Affected classes:
GtkAction
GtkActionGroup
GtkActivatable
GtkIconFactory
GtkImageMenuItem
GtkRadioAction
GtkRecentAction
GtkStock
GtkToggleAction
GtkUIManager

gtk/gtkappchooserdialog.c

@@ -52,7 +52,7 @@
 #include "gtkbbox.h"
 #include "gtkbutton.h"
 #include "gtkmenuitem.h"
-#include "gtkstock.h"
+#include "deprecated/gtkstock.h"
 
 #include <string.h>
 #include <glib/gi18n-lib.h>