Use clutter_actor_destroy in dispose, add _dispose where needed

ClutterGroup calls _destroy, but most of St was just calling _unparent.
This caused problems because the DESTROY signal was not emitted
for child elements after destroying a toplevel.  Also, in a GC'd
binding it would cause unpredictable lifetime of children.

Some St widgets simply didn't have _dispose at all; implement it.

Note because of the usage of the background_image in StButton,
we can't cleanly destroy it inside the StWidget.

https://bugzilla.gnome.org/show_bug.cgi?id=597845

src/st/st-scroll-view.c

@@ -129,13 +129,13 @@ st_scroll_view_dispose (GObject *object)
 
   if (priv->vscroll)
     {
-      clutter_actor_unparent (priv->vscroll);
+      clutter_actor_destroy (priv->vscroll);
       priv->vscroll = NULL;
     }
 
   if (priv->hscroll)
     {
-      clutter_actor_unparent (priv->hscroll);
+      clutter_actor_destroy (priv->hscroll);
       priv->hscroll = NULL;
     }