Changed message param from str to list[str] in chat() and route() commands.
Words are joined with spaces, so 'timmy chat hello how are you' works without
quoting. Single-word messages still work as before.
- chat(): message: list[str], joined to full_message
- route(): message: list[str], joined to full_message
- 7 new tests in test_cli_multiword.py
Closes#26
