Update tests to match, switching some of them to using
getFormatterClass so that the parameter is irrelevant.

Having it return "builtins.str" serves no useful purpose
and it's much easier to return "str" and "dict".

Previously the python type to name conversion was deferred until
the python type was needed.  This is unnecessary and causes
problems with repr() implementations. Now always extract the full
name using getFullTypeName.

Make it more compact by removing entities that are defaulted.

Now consistent in mentioning it returns a Formatter class not
Formatter instance.