1117 - redo entire tangler

Instead of adding a third-level hack for the new bug (failing test) with
multiple directives, I'm giving up on deducing #line directives
directly. Instead I'm going to maintain the file and line for every
single line as I read it, and then emit directives on their basis as a
post-processing step. This way tangling itself can remain oblivious to
line numbers, even if we're passing objects around rather than naked
strings.

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