pothos: work on proxy as universally supported in case of failure
pothos-python: moved converters and deleted unused one
pothos-python: using python marshal for serialize hooks
pothos-python: tweak serialization exception handling
pothos-library: removed WorkerActorInterface - proxy directly to worker actor
pothos-python: fix Proxy_bool, should use ref not ptr
pothos-python: added byte vector support for python convert

Use byte vectors in serialization