- Change the wrapper.config classpath to one line: lib/*.jar
        This means we lose control of classpath load order, so move the windows installer
        jars copy.jar, delete.jar, and exec.jar to a new installer/ directory so
        these jars won't be in the classpath or potentially conflict, since
        copy.jar and delete.jar include FileUtil.class, and we don't want to have
        to remember to add them to the updater if we ever change FileUtil.class.
        Delete the installer/ directory in postinstall.sh since it is windows-only.