examples/lib use the new wrappers

examples/gtk/ex1.nim

@@ -1,14 +1,14 @@
 import 
   cairo, glib2, gtk2
 
-proc destroy(widget: pGtkWidget, data: pgpointer) {.cdecl.} =
-  gtk_main_quit()
+proc destroy(widget: pWidget, data: pgpointer) {.cdecl.} =
+  main_quit()
 
 var
-  window: pGtkWidget
-gtk_nimrod_init()
-window = gtk_window_new(GTK_WINDOW_TOPLEVEL)
-discard gtk_signal_connect(GTKOBJECT(window), "destroy",
-                   GTK_SIGNAL_FUNC(destroy), nil)
-gtk_widget_show(window)
-gtk_main()
+  window: pWidget
+nimrod_init()
+window = window_new(WINDOW_TOPLEVEL)
+discard signal_connect(window, "destroy",
+                       SIGNAL_FUNC(ex1.destroy), nil)
+show(window)
+main()