The stone acts like a kitten; or actually, the robot acts like the stone is a kitten.
Whitespace cleanup.
Refactor: hold list of items.
Refactor: more consistent board representations.

Hoping this will reduce test changes later in the project.
Distinguish kitten from not-kitten
Kitten doesn't quite.
Non-kitten item is non-kitten.
Kitten and stone both look random!