zodiac:add-macro-form

• (zodiac:add-macro-form macro-name vocab macro) -> void
      macro-name : symbol
      vocab : zodiac:vocab
      macro : (zodiac:read zodiac:env -> zodiac:read)

  If a list of tokens is headed by a symbol for which a micro or macro has been defined, then the defined micro or macro is invoked; only otherwise is the micro for lists of tokens invoked.