[META] Istanbul implementation

[gumb0]

Meta EIP https://eips.ethereum.org/EIPS/eip-1679

Accepted EIPs

• EIP-152: Add Blake2 compression function F precompile #5751
• EIP-1108: Reduce alt_bn128 precompile gas costs #5705
• EIP-1344: Add ChainID opcode
  • LegacyVM #5696
  • EVMC ethereum/evmc#375
  • aleth-interpreter #5708
• EIP-1884: Repricing for trie-size-dependent opcodes
  • LegacyVM #5700
  • EVMC ethereum/evmc#372
  • aleth-interpreter #5725
• EIP-2028: Calldata gas cost reduction #5691
• EIP-2200: Rebalance net-metered SSTORE gas cost with consideration of SLOAD gas cost change
  • LegacyVM #5709
  • aleth-interpreter #5728

Maintenance stuff

• Ropsten config update #5758
• Mainnet config update
• Account version support in config parsing, needed only if account versioning is activated #5645
• Support Istanbul in aleth-vm command line parameters #5762

[gumb0]

Updated the categories according to the latest meta-EIP.

[fubuloubu]

Please note that per ethereum/EIPs#2263, EIP-1344 was updated to return a uint64 field instead of uint256

[halfalicious]

@gumb0 I've started working on EIP1380 (reduced gas call to self)

[gumb0]

Moved Berlin fork stuff from the description here to #5768