* Copy over the CLI wallet from Kasparov.
* Fix trivial compilation errors.
* Reimplement the balance command.
* Extract isUTXOSpendable to a separate function.
* Reimplement the send command.
* Fix bad transaction ID parsing.
* Add a missing newline in a log.
* Don't use msgTx in send().
* Fix isUTXOSpendable not checking whether a UTXO is of a coinbase transaction.
* Add --devnet, --testnet, etc. to command line flags.
* In `create`, only print the public key of the active network.
* Use coinbase maturity in isUTXOSpendable.
* Add a readme.
* Fix formatting in readme.
