update ecmarkdown and rephrase use-def lint in terms of expr-parser #519
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The ecmarkdown change required integration work for tc39/ecmarkdown#96 and tc39/ecmarkdown#97. Since part of that work was going to be redoing the use-def lint rule, I figured I might as well just rewrite the rule on top of the expr-parser, as was done for the other rules in #498. I've split that work into its own commit, though it's required for the previous commits to actually build.