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Clean up trace levels everywhere in SubX.
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Key core data structures by hex bytes in text rather than opcode
numbers. Saves us round trips of having to parse and reparse strings,
and also allows us to more easily ignore unexpected non-hex words in
each transform. We'll use this ability next when we start inserting
labels.
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Reorganize layers to introduce the translation workflow right at the start.
We also avoid duplicating parsing code. Programs are always parsed into
the `program` data structure.
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subx: Move register direct mode before indirect in the exposition.
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Instead of organizing layers by instruction, do so by addressing mode.
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