#476 Add serialization listener for component, page, desktop, ses

[Tom M. Yeh]

such that it is easier to implement a serializable attribute or listener.

Example,
public interface ComponentSerializationListener {
/** Called when a component is going to serialize this object.
*/
public void willSerialized(Component comp);
/** Called when a component has de-serialized this object back.
*/
public void didSerialized(Component comp);
}

[Tom M. Yeh]

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Ready since 6/7