cleanup: remove outdated comments and unused files

ERC1271 probably was there as part of account abstraction support, but that's not in master, so neither should be those files.

Author: jtakalai

packages/network-contracts/contracts/OperatorTokenomics/testcontracts/TestToken.sol

@@ -8,16 +8,15 @@ import "../IERC677.sol";
 import "../IERC677Receiver.sol";
 
 /**
- * Mintable TestToken for contract tests
- * Transfers of 666 are rejected with return value false
+ * Freely mintable TestToken for contract tests.
+ * Mostly very similar to DATAv2, TODO: use the real DATAv2 instead.
  */
 contract TestToken is ERC20, IERC677 {
     constructor (string memory name, string memory symbol) ERC20(name, symbol) {
         // solhint-disable-previous-line no-empty-blocks
     }
 
     /**
-     * Token contract owner can create tokens
      * @param recipient address where new tokens are transferred (from 0x0)
      * @param amount scaled so that 10^18 equals 1 token (multiply by 10^18)
      */