Remove unused imports (#129)

* rm unused imports

* typos

* Revert "typos"

This reverts commit baee8743b59621e63732b44121e7696bee569ad5.

packages/contracts/contracts/optimistic-ethereum/OVM/verification/OVM_FraudVerifier.sol

@@ -11,8 +11,6 @@ import { iOVM_FraudVerifier } from "../../iOVM/verification/iOVM_FraudVerifier.s
 import { iOVM_StateTransitioner } from "../../iOVM/verification/iOVM_StateTransitioner.sol";
 import { iOVM_StateTransitionerFactory } from "../../iOVM/verification/iOVM_StateTransitionerFactory.sol";
 import { iOVM_BondManager } from "../../iOVM/verification/iOVM_BondManager.sol";
-import { iOVM_ExecutionManager } from "../../iOVM/execution/iOVM_ExecutionManager.sol";
-import { iOVM_StateManagerFactory } from "../../iOVM/execution/iOVM_StateManagerFactory.sol";
 import { iOVM_StateCommitmentChain } from "../../iOVM/chain/iOVM_StateCommitmentChain.sol";
 import { iOVM_CanonicalTransactionChain } from "../../iOVM/chain/iOVM_CanonicalTransactionChain.sol";