Snakes shouldn't spawn on top of other snakes.

[46bit]

At present snakes are spawned as a single segment in a randomly chosen cell. This is unfortunate because it means snakes will sometimes spawn on top of other snakes.

A naive solution is:

(1) Generate a random cell C
(2) Loop over all snakes, checking if they have C as a segment, and going back to (1) if so

This will loop infinitely if all cells are occupied. That will not always be possible under the rules, unless spawning into an existing game.

Come up with a decent solution for now.

[46bit]

Also - should snakes be allowed to spawn on top of food?