Implement UTF-8 string validation for SmallCString.
In PacketOut Yaml, display buffer_id and in_port in hex.
Optional auxiliary_id is displayed in Hex.
In PacketIn Yaml, display values as hex.
In FeaturesReply Yaml, display values as hex.
In Error Yaml, display values as hex.
In Experimenter Yaml, display values as hex.
In Bucket Yaml, display values as hex.
In Queue Yaml, display values as hex.
In TableFeatureProperty Yaml, display values as hex.
In Actions Yaml, display values as hex.
In Instructions Yaml, display values as hex.