A utility function toAddress

[hexcowboy]

I'm proposing a fromHex variant and shortcut function called toAddress that takes a Hex string and converts to an Address.

Use case would be reading a raw storage slot of solidity type address which returns something like 0x0000000000000000000000005eb5babcefea846b220c82f222f00df95934f5f0. Right now there isn't a direct way to convert this to a 20 byte address.

Let me know if I get the green light for a PR!