asm highlighting: park the work with its findings (not merged)

IDA already classifies every disassembly token for every processor it supports —
generate_disasm_line emits \x01<tag>text\x02<tag> and the tag says what the text
IS — so this needs no lexer at all, and certainly not a pygments asm lexer, which
would be a worse guess and need one dialect per architecture.

Working implementation is in docs/wip-asm-spans.patch and verified on echo:
"lea rcx, function; \"usage\"" tokenises as insn/text/reg/punct/text/name/cmt,
with sane coverage over 400 rows.

Not merged: it breaks listing_view's "undefining a data head yields an unknown
run" (reports kind=data). Bisected to this change on a fresh database — 10/0 with
it stashed, 9/1 with it applied. The span code doesn't touch `kind`, so the cause
is not yet understood, and I would rather park a working-but-unexplained change
than merge one that makes a real check lie.

TODO records the two non-obvious findings so the next attempt doesn't repeat
them: the constants are SCOLOR_DATNAME/SCOLOR_CODNAME (no SCOLOR_DNAME, and a
wrong guess fails silently as plain body text), and spans must be
whitespace-collapsed by walking characters, not per span, because a run of
spaces straddles span boundaries.

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