…le with regular `Promise` types.

`@0x/contracts/exchange` Make `OrderValidator` and `WalletOrderValidator` signature types checked for every fill (not just first)'

…derValidator` signature types on every fill

`@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.

…rror` and `SignatureValidatorError` `RevertError` types.

`@0x/order-utils`: Add `SignatureOrderValidatorNotApprovedError` and `SignatureValidatorNotApprovedError` `RevertError` types.

…alletOrderValidator` if `makerAddress == this`.

`@0x/contracts-exchange`: Update tests for repeatable signature validation.

…tureType`

`@0x/types`: Add `EIP1271Wallet` and `EIP1271OrderWallet` to `SignatureType`

…gnatureOrderWalletError` `RevertError` type.

…et` signature type

`@0x/contracts-exchange`: Rename `SignatureWalletOrderValidatorError` to `SignatureOrderWalletError`
`@0x/contracts-exchange`: Add `IEIP1271Wallet` interface
`@0x/contracts-exchange`: Add `EIP1271Wallet` and `EIP1271OrderWallet` to `SignatureType`
`@0x/contracts-exchange`: Always check `OrderValidator`, `OrderWallet`, `EIP1271OrderWallet` signature types on every fill
`@0x/contracts-exchange`: Add tests for EIP1271 signature types.
`@0x/contracts-exchange`: Update `LibExchangeRichErrorDecoder` for new/renamed Error types.

…LibEIP1271` contract and inherit from that.

`@0x/contracts-exchange`: Use `LibBytes.readBytes4()` to validate EIP1271 return values and be more permissive of shorter return values.
`@0x/contracts-exchange`: Use `abi.decode()` for `EIP1271OrderWallet` in `TestSignatureValidator.sol`.
`@0x/contracts-exchange`: Correct minor formatting changes in contracts.

… `MixinSignatureValidator.sol`

`@0x/contracts-exchange`: Fighting with linearization issues.

`@0x/contracts-exchange`: Remove references to removed signature types and associated functions.

…let`.

… types.

`@0x/contracts-exchange`: Update `Whitelist` example for new signature types.

…dFillResults` public

…ain.

…alidator.sol`