Add UniswapX as dep and rip out old code (#1)

* forge install: UniswapX

v1.1.0

* Rip out old code and use imports

* forge install: UniswapX

main

* Silence warnings

* fix error

* nit: ordering of inputs

* gas specs

.forge-snapshots/RelayOrderReactorIntegrationTest-testExecute.snap

@@ -1 +1 @@
-264847
+264776

.forge-snapshots/RelayOrderReactorIntegrationTest-testPermitAndExecute.snap

@@ -1 +1 @@
-312312
+312241

.gitmodules

@@ -16,3 +16,7 @@
 [submodule "lib/permit2"]
 	path = lib/permit2
 	url = https://github.com/Uniswap/permit2
+[submodule "lib/UniswapX"]
+	path = lib/UniswapX
+	url = https://github.com/Uniswap/UniswapX
+	branch = main

remappings.txt

@@ -9,3 +9,4 @@ solmate/=lib/solmate/
 erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/
 openzeppelin/=lib/openzeppelin-contracts/contracts/
 universal-router/=lib/universal-router/
+UniswapX/=lib/UniswapX/

src/base/ReactorStructs.sol

@@ -1,37 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 pragma solidity ^0.8.0;
 
-import {IReactor} from "../interfaces/IReactor.sol";
-import {IValidationCallback} from "../interfaces/IValidationCallback.sol";
 import {ERC20} from "solmate/src/tokens/ERC20.sol";
-
-/// @dev generic order information
-///  should be included as the first field in any concrete order types
-struct OrderInfo {
-    // The address of the reactor that this order is targeting
-    // Note that this must be included in every order so the swapper
-    // signature commits to the specific reactor that they trust to fill their order properly
-    IReactor reactor;
-    // The address of the user which created the order
-    // Note that this must be included so that order hashes are unique by swapper
-    address swapper;
-    // The nonce of the order, allowing for signature replay protection and cancellation
-    uint256 nonce;
-    // The timestamp after which this order is no longer valid
-    uint256 deadline;
-    // Custom validation contract
-    IValidationCallback additionalValidationContract;
-    // Encoded validation params for additionalValidationContract
-    bytes additionalValidationData;
-}
-
-/// @dev tokens that need to be sent from the swapper in order to satisfy an order
-struct InputToken {
-    ERC20 token;
-    uint256 amount;
-    // Needed for dutch decaying inputs
-    uint256 maxAmount;
-}
+import {OrderInfo, OutputToken} from "UniswapX/src/base/ReactorStructs.sol";
 
 /// @dev tokens that need to be sent from the swapper in order to satisfy an order
 struct InputTokenWithRecipient {
@@ -42,13 +13,6 @@ struct InputTokenWithRecipient {
     address recipient;
 }
 
-/// @dev tokens that need to be received by the recipient in order to satisfy an order
-struct OutputToken {
-    address token;
-    uint256 amount;
-    address recipient;
-}
-
 struct ResolvedRelayOrder {
     OrderInfo info;
     bytes[] actions;
@@ -57,19 +21,3 @@ struct ResolvedRelayOrder {
     bytes sig;
     bytes32 hash;
 }
-
-/// @dev generic concrete order that specifies exact tokens which need to be sent and received
-struct ResolvedOrder {
-    OrderInfo info;
-    InputToken input;
-    OutputToken[] outputs;
-    bytes sig;
-    bytes32 hash;
-}
-
-/// @dev external struct including a generic encoded order and swapper signature
-///  The order bytes will be parsed and mapped to a ResolvedOrder in the concrete reactor contract
-struct SignedOrder {
-    bytes order;
-    bytes sig;
-}