use ERC20 datatype

contracts/EventAndErrors.sol

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.9;
 
+import { ERC20 } from "./lib/tokens/ERC20.sol";
+
 // prettier-ignore
 interface EventAndErrors {
     /// ███ Events ████████████████████████████████████████████████████████████
@@ -8,17 +10,17 @@ interface EventAndErrors {
     event DepositAdded(
         address indexed seller,
         // uint256 depositID,
-        address token,
+        ERC20 token,
         uint256 amount
     );
     event ValidSet(
         address indexed seller,
-        address token,
+        ERC20 token,
         bool state
     );
     event DepositWithdrawn(
         address indexed seller,
-        address token,
+        ERC20 token,
         uint256 amount
     );
     event LockAdded(