Colliding with wall doesn't result in death

[sector-f]

Upon "hitting" a wall, the snake simply wraps around to the other side. I am unsure if this is a bug or a feature, but it is worth pointing out that hitting the wall normally results in dying in Snake.

[kirjavascript]

Not colliding with a wall is behaviour taken from Snake II on the (canonical) Nokia 3310, but I wouldn't mind having this as something that could be toggled - preferably at runtime but compile time works too