Find robots

[xsebek]

• add robotNamed : string -> cmd robot
• add chess horse challenge 🏇

In challenges, it's impossible to know beforehand what the robot ID will be.
Seems like we should be able to find it by its name though.

[xsebek]

The challenge is a bit hard* but not impossible:

move; move; move; turn right; move; turn left; move;

I like that we can customize all this in current challenges. 👍
Being able to query the position of an arbitrary robot makes it even sweeter.

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^{*) Unless you turn east and cheese it of course 😀}

[byorgey]

Makes sense, I like it.

Hmm, maybe there should be a "compass" device which you need to use directions like east, west etc. Then we could prevent cheesing this challenge by not starting the robot with a compass...