Massively improve performance

[tigercat2000]

This fixes two problems that were slowing IDB down a ton:

1. tracing::instrument by default calls Debug::fmt on each argument each time a function is called - this was the main issue for IDB, as it has functions taking entire DMIs as arguments, which have default Debug implementations that write every byte
2. https://github.com/spacestation13/BYONDDiffBots/pull/40/files removed par_values on fn full_render(), which meant that full renders (new file, deleted file) were creating states serially. This happened because IndexMap::par_value is locked behind a feature flag that we at some point stopped enabling, yay for transitive feature flags.

Profile captured over the first 1000 images generated by tigercat2000/IconDiffBot2-test#22

Profile overview before:

Profile overview after:

Main difference is that the tokio-runtime-worker thread is no longer pegged at 99% CPU the entire time.