AVIS: Added opaque data type serialization and deserialization
AVIS: Added opaque data type serialization and deserialization

There was already support for opaque data types but they could
not be serialized or deserialized. This patch should remedy
this.

Signed-off-by: Frank Quinn <8e90d92b6718ce33106d66386b493961926d3d82@gmail.com>

dpauls/OpenMAMA,philippreston/OpenMAMA,cloudsmith-io/openmama,cloudsmith-io/openmama,dpauls/OpenMAMA,fquinner/OpenMAMA,cloudsmith-io/openmama,cloudsmith-io/openmama,dpauls/OpenMAMA,vulcanft/openmama,cloudsmith-io/openmama,dpauls/OpenMAMA,philippreston/OpenMAMA,philippreston/OpenMAMA,philippreston/OpenMAMA,fquinner/OpenMAMA,cloudsmith-io/openmama,philippreston/OpenMAMA,dpauls/OpenMAMA,vulcanft/openmama,fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA,vulcanft/openmama,vulcanft/openmama,dpauls/OpenMAMA,dpauls/OpenMAMA,vulcanft/openmama,vulcanft/openmama,fquinner/OpenMAMA,fquinner/OpenMAMA,cloudsmith-io/openmama,philippreston/OpenMAMA,vulcanft/openmama,philippreston/OpenMAMA