get rid of defclass-star dependency by expanding a few macros inline and keeping their original in commented out form

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A defsuite is really a deftest now with a RUN-CHILD-TESTS flet inside it and
its args are &optional.

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Hint:
(defsuite foo
  (with-fixture bar
    (run-child-tests)))

Incompatible change: (defsuite suite :bar 42) => (defsuite (suite :bar 42)).

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