Feature: Addresses stored in smart-contracts need to be lowercase, allow any case

[benzap]

The culprit

When issuing a contract keyword for the event log generated, the designated contract will fail if smart contract addresses are stored as checksummed addresses, and not as lower-case addresses

The current fix is to store addresses in the smart contract in lowercase, but the contract-by-address function could show some improvements by allowing lowercase and checksum'd addresses