Cleans up the PredeployAddresses contract. I went ahead and clearly
marked and separated the legacy addresses and the non-legacy addresses.
I also renamed the L2StandardTokenFactory address to correspond to the
new name (OptimismMintableERC20Factory) and deleted several predeploy
addresses which no longer exist in the state of L2.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>