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/gtklinkbutton.c

@@ -52,7 +52,7 @@
 
 #include "gtkclipboard.h"
 #include "gtkdnd.h"
-#include "gtkimagemenuitem.h"
+#include "deprecated/gtkimagemenuitem.h"
 #include "gtklabel.h"
 #include "gtkmain.h"
 #include "gtkmarshalers.h"