* core/vm: implement EIP 1344 (ChainID opcode) * core/vm: formatting
* core/vm, tests: implement EIP 1884, add support for feature-tests * core/vm: 1884-changes to extcodehash, move selfbalance opcode * tests: fix statetests * core/vm: move constants, address review concerns * core/vm: word formatting Co-Authored-By: Péter Szilágyi <peterke@gmail.com>