Built-in transaction viewer

[polymorpher]

Because 1wallet transactions are based on smart contracts, it is extremely hard to view past transactions of a 1wallet on Harmony explorer, or to get useful information from a particular transaction. For example, in all transactions, the senders of the transactions are displayed as the relayer's address, and the destinations are displayed as the 1wallet address itself. No matter how much money was sent in the transaction (or how many tokens), the value column is always displayed as 0. Failed transactions (e.g. failing authentication, insufficient funds, over limit, etc.) are also displayed as success on the explorer, because the smart contract call itself was success. This has been causing massive confusion to 1wallet users.

We need a comprehensive built-in transaction explorer that shows all past successful and failed transactions of any 1wallet. #251 is a good starting point.

[polymorpher]

Done in #251