Feature events

[metachris]

EventHub and logging.

Many commits, many changes. Will add some documentation to the README / docs in a later step. A prompt user doesn't really notice much, except a bit more log messages, and the option to use config debug on/off and config sc-events on/off.

For devs that use neo-python as library, this is a great many essential changes. It allows to send all the log messages into logfiles, and to easily react to smart contract events.

[coveralls]

Coverage increased (+0.4%) to 67.732% when pulling 863b408 on feature-events into 1d0684b on development.

[localhuman]

Just wanted to leave a comment here about the new way to subscribe to SC events:

smart_contract = SmartContract("6537b4bd100e514119e3a7ab49d520d20ef2c2a4")
 
@smart_contract.on_notify
def sc_notify(event):
  print("SmartContract Runtime.Notify event:", event)
  if len(event.event_payload):
    print(event.event_payload[0].decode("utf-8"))

Great work by @metachris !