translate-underscore-separated-name is a helper function for
specializations of translate-name-from-foreign and
translate-name-to-foreign. It handles the common case of
converting between foreign underscore_separated names and lisp names.
CFFI> (translate-underscore-separated-name some-xml-function) ⇒ "some_xml_function" CFFI> (translate-camelcase-name "some_xml_function") ⇒ SOME-XML-FUNCTION
translate-name-from-foreign
translate-name-to-foreign
translate-camelcase-name