`@0x/contracts-utils`: Correct internal variable naming in `src/index.ts`.
`@0x/contracts-exchange`: Remove functions from `TestExchangeInternals.sol` that are now in other packages.
`@0x/contracts-exchange`: Remove `TestExchangeMath.sol`. Exchange math functions are now tested in `@0x/contracts-exchange-libs`.
`@0x/contracts-exchange`: Move `ReferenceFunctions` to default package export.
`@0x/contracts-exchange`: Update `match_order.ts` tests to use reference math functions instead of `TestExchangeMath`.
`@0x/contracts-exchange`: Remove `_updateFilledState()` combinatorial tests in favor of normal unit testing. Combinatorial testing was overkill.
`@0x/contracts-exchange`: Update/refactor `calculateFillResults()` combinatorial tests to use the reference functions and hide them behind `TEST_ALL`.
`@0x/contracts-exchange`: Add `validatorAddress` field to `SignatureValidatorError` and `SignatureOrderValidatorError` rich reverts
`@0x/contracts-exchange`: Add separate `SignatureOrderValidatorNotApprovedError` for `OrderValidator` signatures
`@0x/contracts-exchange`: Consolidate Wallet and Validator test contracts into a single configurable `TestValidatorWallet` contract.
`@0x/contracts-exchange`: Rewrite many tests in `signature_validator.ts` for brevity.
* In `@0x/contracts-exchange`: Add `SignatureType.OrderValidator` support to contracts and refactor signature validation functions.
* In `@0x/types`: Add `SignatureType.OrderValidator` and `RevertReason.InappropriateSignature`.
* In `@0x/contracts-exchange`: Fix contracts and update tests for `SignatureType.OrderValidator`.
* Ran prettier/linter
* Update changelogs
* In `@0x/order-utils`: Add `SignatureOrderValidatorError` to `ExchangeRevertErrors`.
* In `@0x/contracts-exchange`: Add `SignatureOrderValidatorError` rich revert. Fix rebase issues. Rename `IValidator.isValidOrder` to `IValidator.isValidOrderSignature`.
* In `@0x/contracts-exchange`: Add revert test cases for `OrderValidator` signature type.
* In `@0x/order-utils`: Update changelog.
* In `@0x/contracts-exchange`: Split off `SignatureType.OrderValidator` scheme into its own interface and registry.
* In `@0x/types`: Add `SignatureType.WalletOrderValidator`.
* In `@0x/order-utils`: Add `SignatureWalletOrderValidatorError`.
* In `@0x/contracts-exchange`: Add `SignatureType.WalletOrderValidator` support.
* Ran prettier
* In `@0x/types`: Remove `RevertReason.WalletOrderValidator`.
* Update/fix changelogs in `@0x/contracts-exchange`, `@0x/order-utils`, and `@0x/types`.
* In `@0x/contracts-exchange`: Make `isValidOrderSignature` `external` instead of `public`.
* In `@0x/contracts-exchange`: Change `isValidOrderSignature` back to `public` because passing `calldata` to internal functions isn't supported.
In `@0x/contracts-exchange`: Change `AssetProxyTransferError` to accept a `revertData` bytes instead of a `revertReason` string.
In `@0x/contracts-exchange`: Aadd `contracts/test/TestRevertReceiver.sol` for testing that validator/wallet reverts are properly wrapped.
