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ASV: support PHP 7.4 serialization methods

The AbstractSerializableValue base class
uses the new __serialize and __unserialize magic methods now
(see https://wiki.php.net/rfc/custom_object_serialization).

This allows a much more compact serialization output format.

This change breaks forward compatibility of earlier versions
of this library older than v1.3/v2.2 because they won't
understand the new serialization format.

Backwards compatibility is preserved
because this library still understands the older serialization format
even when running in a PHP 7.4+ environment.

If you have only one deployment of this library
or if there's no persistent storage at all,
upgrading to this release is unproblematic.

If however there's a possibility that the newer serializations
created by this release in a PHP 7.4+ environment
will be read by a pre-v2.2 installation of this library,
you'll have to upgrade these installation to v1.3/v2.2 or newer
or risk incompatibility errors when unserializing.

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