Add requirement for SequenceTraits<T>::next.
Fix typo bug in parsing OriginalMatch.
Improve SequenceTraits for TableFeatureProperties.
Add TypedPropertyIterator template for YAML use.
Improve SequenceTraits for QueuePropertyRange.
Improve SequenceTraits for OXMIDRange.

Remove nthItem, nthItemIf, countItemsIf methods from ProtocolRange.
In YAML encoding, indicate OXMID's with mask set by *
Improve SequenceTraits for ActionRange.
Big8 is now a class.

Output Big8 in hex for YAML.
Big8 is now a class (rather than a typedef).
Remove BigEndianUnaligned. (unused).
Add yang/inet types from RFC 6991.