[Nitro] Og [patch]: Rename write_attr_<class> to serialize_attr_<class>

[Mark Van De Vyver]

These changes should have no effect at the users level?

* Rename write_attr_<class> to serialize_attr_<class>
  These names properly reflect what is happening.  Renaming is also a
precursor to some changes that 1) DRY out the serialization that
occurs in Og, 2) Should permit Og's type mapping to be extensible
(without touching the code).
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