When the command ends, the last step should be to actually "stop" it, not before, as some data already goes lost when stopping the conversation.

reintroduced update()

Some typo corrections.

Conversations code review

* mboretto/feature/smartinterface:
  conversation as internal member

Conflicts:
	src/Commands/AdminCommands/SendtochannelCommand.php

Refactor a bit to facilitate testing.
Add missing documentation.

Cancel command

Add more documentation.
Refactor code and adjust output to user.

Use the new emptyResponse() method