Use the actual KCL console (over telnet)

[gavanderhoorn]

Right now, dominh executes KCL commands using the karel/kcl entry point (ie: the controller's web server tunnels requests to the local KCL interpreter and returns the output.

This adds a substantial amount of overhead to every KCL command executed (on the order of 500 ms for a single line of KCL on an R-30iB+), even with the web servers headers disabled.

On many controllers, the KCL console is actually reachable over telnet on tcp://:22. It would make sense to use it in those cases, as typical commands would only take a couple hundred bytes to send and receive the response.

Parsing would be different, as the telnet interface makes quite heavy use of formatting codes, but seems doable.