Rewrite pretty printer

[Kmeakin]

Rewrote the surface pretty printer using the algorithm from A New Language-Independent Prettyprinting Algorithm. The resulting code is a little imperative compared to the old functional style, but I think it should be possible to write a functional wrapper around the imperative algorithm.

TODO:

• Tweak heuristics to match the old pretty printing output
• Avoid emitting trailing whitespace at the end of lines

[Kmeakin]

Benchmark results

• Peak heap usage, as measured by heaptrack ./target/release/fathom data --module formats/opentype.fathom /usr/share/fonts/liberation/LiberationMono-Bold.ttf
  • main: 142.9MB
  • new-pretty: 10.4MB
• Runtime, as measured by hyperfine -w 1 -r 10 "./target/release/fathom data --module formats/opentype.fathom /usr/share/fonts/liberation/LiberationMono-Bold.ttf":
  • main: 328.9 ms ± 4.0 ms
  • new-pretty: 24.0 ms ± 0.5 ms

[Kmeakin]

Abandoned in favour of #483