[parc] replace struct pack/unpack w rlib
[parc] replace struct pack/unpack w rlib

moreati/pydgin,cornell-brg/pydgin,cornell-brg/pydgin,moreati/pydgin,futurecore/pydgin,moreati/pydgin,moreati/pydgin,cornell-brg/pydgin,futurecore/pydgin,futurecore/pydgin,cornell-brg/pydgin,futurecore/pydgin