Ethereum London Hardfork support

[hackfisher]

https://blog.ethereum.org/2021/06/18/london-testnets-announcement/

Include:

EIP-1559: Fee market change for ETH 1.0 chain
EIP-3198: BASEFEE opcode
EIP-3529: Reduction in refunds
EIP-3541: Reject new contracts starting with the 0xEF byte
EIP-3554: Difficulty Bomb Delay to December 1st 2021

Affected(Current found)

• https://eips.ethereum.org/EIPS/eip-1559 Support EIP-1559 #701
• https://eips.ethereum.org/EIPS/eip-3554

References:

1. https://github.com/openethereum/openethereum/blob/fdaee51ca07710081d27722449478b20dfbf72c9/crates/ethcore/types/src/header.rs#L374-L376
2. https://github.com/openethereum/openethereum/blob/fdaee51ca07710081d27722449478b20dfbf72c9/crates/ethcore/res/chainspec/ropsten.json#L21
3. https://github.com/openethereum/openethereum/blob/193b25a22d5ff07759c6431129e95235510516f9/crates/ethcore/src/ethereum/ethash.rs#L80

[hackfisher]

darwinia-common/primitives/ethereum-primitives/src/pow.rs

Line 130 in d8896a3

difficulty_bomb_delays: {