See Left / Right Wall would be nice to implement proper wall following.

[DivineThreepwood]

would improve wall following.

[tommy33790]

Slightly different to #54 because it's about "do I see a wall at x degrees to the left / right?"
Using this, one should be able to create wall following rules like: "if no wall on the left, turn left and go" until the agent finds the wall again.