Passes that are required for a circuit to usable, rather than just for improving performance, are now called transformers instead of optimisations.

Transforms:
fallback
r1cs
csat

Optimisations:
general
more to come

General optimising is now separated into its own pass instead of being executed by r1cs of csat. As a result the r1cs pass current has no work to perform.

* master:
  feat: Update Arkworks' dependencies on `acir_field` (#69)
  add tests for `from_hex` and `to_hex` (#85)
  improve field formatting (#84)
  chore(ci): Leverage reusable workflows (#81)
  fix clippy (#82)
  0.4.1 Release
  remove duplicated match statement for Directive::Log (#79)
  0.4.0 Release
  update changelog
  feat(acvm): Directive for sorting networks (#77)
  feat: Preprocess methods for ACVM interface  (#71)
  expose acir_field through acir (#75)
  chore(acvm): rename remaining references to gadget calls (#76)
  feat: Add Log Directive (#61)
  blackbox to black_box (#72)
  feat(ci)!: add spellchecker (#73)