cli: porcelain

[cirocosta]

at the moment, all we do is output the json representation of the internal structures that we have in go structs.

given that we already have -v to put under stderr the json as it goes through the wire, let's make the cli pretty 💅

[cirocosta]

implemented a pretty() for pretty much every command, except those that don't make a lot of sense (like for getting block templates).

e.g.

$ monero daemon rpc-access-tracking
RPC                             COUNT   TIME SPENT SERVING      CREDITS
getblockhash                    1       10.157µs                0
get_height                      1       26.892µs                0
rpc_access_tracking             7       52.88µs                 0
get_last_block_header           2       78.08µs                 2
hard_fork_info                  8       83.389µs                8
get_transaction_pool_stats      8       577.286µs               8
get_connections                 1       671.059µs               0
get_transactions                4       1.143642ms              4
get_info                        1       1.304111ms              1
get_public_nodes                5       15.813432ms             0
get_peer_list                   15      52.716227ms             0
sync_info                       19      54.221358ms             38
get_transaction_pool            6       65.775668ms             116
get_coinbase_tx_sum             1       1m8.209161023s          4804044

[cirocosta]

ps.: definitely need some better support for displaying the proper units of certain fields, like

$ Bytes Max:                              2734
Bytes Med:                              1457
Bytes Min:                              1452
Bytes Total:                            45201
Fee Total:                              978930000
Histogram 98pct:                        0
Txns in Pool for Longer than 10m:       0
Double Spends:                          0
Failing Transactions:                   0
Not Relayed:                            0
Oldest:                                 4 minutes ago
Txns Total:                             27

BYTES                                   TXNS
2734                                    1
1456                                    1
5390                                    3
4879                                    3
3418                                    2
5834                                    4
12253                                   7
1452                                    1
2907                                    2
4878                                    3

but, I'll improve those as we go.