Switch from webidl to weedle in script_plugins
This removes the dependency on lalrpop and should speed up compilation
quite a bit.
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I don't want to do such a gratuitous rename, but with all the other types
now having "Dom" as part of their name, and especially with "DomOnceCell",
I feel like the other cell type that we already have should also follow
the convention. That argument loses weight though when we realise there
is still DOMString and other things.
Make tidy aware of Rust multiline strings
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This makes the internal tidy script properly ignore the contents of Rust multiline strings.
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As a result of tighter and more correct handling of character
literals, this now catches a few kinds of syntax involving lifetimes
that were previously missed, so those have been updated.
