Port to Clutter-0.9

tools/build/gnome-shell.modules: Point  at master branch of Clutter (0.9)
  and make gobject-introspection a dep of Clutter.
configure.ac src/Makefile.am: Use Clutter-0.9
js/ui/button.js js/ui/genericDisplay.js js/ui/overlay.js js/ui/panel.js
js/ui/runDialog.js js/ui/workspaces.js src/shell-status-menu.c:
  Use ClutterText instead of ClutterLabel and ClutterEntry
js/ui/workspaces.js js/ui/genericDisplay.js: Use ClutterClone instead
  of ClutterCloneTexture
src/shell-global.[ch]: Add Shell.get_event_key_symbol() to workaround
  unaccessibility of clutter_key_event_symbol() to use.
js/runDialog.js js/overlay.js: Use Shell.get_event_key_symbol() as
  appropriate.

src/shell-global.c

@@ -421,6 +421,15 @@ shell_get_categories_for_desktop_file(const char *desktop_file_name)
     return categories_list;
 }
 
+guint16
+shell_get_event_key_symbol(ClutterEvent *event)
+{
+  g_return_val_if_fail(event->type == CLUTTER_KEY_PRESS ||
+                       event->type == CLUTTER_KEY_RELEASE, 0);
+
+  return event->key.keyval;
+}
+
 /**
  * shell_global_get:
  *