nautilus-window: don't use libgd notifications
We are using notifications just for one window and one type of notification and only one notification at once, so we don't need to use notification-manager from libgd. Given that the manager is not necessary, the reasons to use libgd notifications becomes weak. Instead of libgd notifications create our own with a GtkRevealer and remove all the libgd notifications, so we have a cleaner code.
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