default void updateOutward() {
        // Update internal conns first
        boolean internal = updateInternalConns();
        // If open conns changed, update external conns as well
        boolean external = updateOpenConns() && updateExternalConns();
        maskChangeEvent(internal, external);
    }
Updates internal connections first, then updates open conns.
If open conns change, then external conns are updated.
<p>
Use this when an internal part change occurs.
core/src/main/java/mrtjp/projectred/core/part/IConnectablePart.java