StandardArbERC20.sol Spec
Standard (i.e., non-custom) contract deployed by L2Gateway.sol as L2 ERC20. Includes standard ERC20 interface plus additional methods for deposits/withdraws
bridgeInit(address _l1Address, bytes _data) (public)
initialize the token
the L2 bridge assumes this does not fail or revert
_l1Address: L1 address of ERC20_data: encoded symbol/name/decimal data for initial deploy