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As we're trying to move away from gob for serialising data over the wire, this commit adds the capability for Packer to pick dynamically between gob or protobuf for the serialisation format to communicate with plugins. As it stands, if all the plugins discovered are compatible with protobuf, and we have not forced gob usage, protobuf will be the serialisation format picked. If any plugin is not compatible with protobuf, gob will be used for communicating with all the plugins that will be used over the course of a command.