Implement EIP55 for ENS verification

[rachelhamlin]

Problem

I found a bug in ENS registration where it checks for already owned name. I needed ENS name to test the name UI part and tried to get already owned name registered in the app - but it failed to recognize I am the owner of the name even though I did own the name.

Turns out comparision of resolved name to wallet address in app failed because of difference in eip55 checksum. I got it to recognize my name as owned, by adding eip55/address->checksum on top of ethereum/normalized-address during comparision.

Also of note is that [:app-db :multiaccounts :address] stored is not eip55 checksummed address rather than the address resolved by the contract.

Identified by Bitsikka in #8069.

Implementation

Implement EIP55 for ENS address registration/verification. http://eips.ethereum.org/EIPS/eip-55

Acceptance Criteria

Checksummed and non-checksummed addresses can both be verified and used in Status.

[rachelhamlin]

Fixed in #8069