Rename arbitrator/ dir to crates/ (#406)

Author: pmikolajczyk41

src/osp/OneStepProverHostIo.sol

@@ -149,7 +149,7 @@ contract OneStepProverHostIo is IOneStepProver {
         bytes memory extracted;
         uint8 proofType = uint8(proof[proofOffset]);
         proofOffset++;
-        // These values must be kept in sync with `arbitrator/arbutil/src/types.rs`
+        // These values must be kept in sync with `crates/arbutil/src/types.rs`
         // and `arbutil/preimage_type.go` (both in the nitro repo).
         if (inst.argumentData == 0) {
             // The machine is asking for a keccak256 preimage

test/prover/one-step-proof.ts

@@ -18,7 +18,7 @@ async function sendTestMessages() {
       await deployments.get('SequencerInboxStub')
     ).address
   )
-  const msgRoot = '../arbitrator/prover/test-cases/rust/data/'
+  const msgRoot = '../crates/prover/test-cases/rust/data/'
   const gasOpts = {
     gasLimit: ethers.utils.hexlify(250000),
     gasPrice: ethers.utils.parseUnits('5', 'gwei'),