JSSerialization: Functions for (de)serialization of jsvals

Implements the ISerializable interface; see there. (TODO: link)

note: code is marked "WIP, not yet functional" (seen 2005-07-19)

In addition to ISerializable, the following operations are available:

• After a Deserialize() call, the class may be cast to jsval or CStr and the deserialized data will be converted and returned as such.