* ethcore/res: activate Istanbul on Ropsten, Görli, Rinkeby, Kovan (#11068)
* ethcore/res: activate Istanbul on Ropsten block 6485846
* ethcore/res: activate Istanbul on Goerli block 1561651
* ethcore/res: use hex values for Istanbul specs
* ethcore/res: fix trailing comma
* ethcore/res: be pedantic about EIP-1283 in Petersburg and Istanbul test specs
* ethcore/res: activate Istanbul on Rinkeby block 5435345
* ethcore/res: activate Istanbul on Kovan block 14111141
* ethcore/res: fix kovan istanbul number to 0xd751a5
* [json-spec] make blake2 pricing spec more readable (#11034)
* [json-spec] make blake2 pricing spec more readable
* [ethcore] fix compilation
* Manual backport of #11033
