Make some address related settings runtime config instead of hardcoding them

[yarkinwho]

 string  public linkedEOSAccountName;
 address public linkedEOSAddress;
 address public evmAddress;

these three in the solidity contract.

This will make life easier if we want to deploy the bridge against evm on other accounts.

[yarkinwho]

for evmAddress, maybe get it from coinbase instead of make it a config.