0x03 Withdrawal Credentials: Simple Eth1-triggerable withdrawals

I think it should not be a specialized Exit contract, but a generic MessageBeaconChain contract, where the semantics of the message are only parsed on beacon chain side.

If spam is a consideration even with tx fees, one can hook up an additional eth-burning to the contract (e.g. you have to send 0.001 ETH for message to be passed on the beacon chain side).

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