154 integration tests

[skx]

Borrowing the idea, but not the implementation, from iz-cpm , this pull-request closes #154 by adding integration tests.

That means:

• We launch the CCP.
• We send fake input to it.
• We read back the output/replies.
• And confirm they match expectations.

One of the tests plays the lighthouse of doom to completion, which is pretty awesome to see!