Rewrite the macro expander to use set of scopes.HEADmain

I no longer have confidence that the timestamp approach will work for
all of the different cases that aren't discussed in the original paper.
The original paper was only about expanding a fixed set of syntax
transformers, and didn't consider defining new transformers.

Set of scopes is an extremely intuitive system, and hopefully that will
mean it's easier to implement without bugs. I think I finally understand
how it works after watching this video: https://youtu.be/Or_yKiI3Ha4

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