[EM] Yee-Bolson Diagrams for Lotteries

[Raph Frank]

It would also be possible to support more than 3 if you are willing to
accept some ambiguous pixels.

You could give each candidate a colour and then blend the colours in
proportion to the probability.

For a method which has reasonably sharp edges to the win regions, this
could be reasonably effective.

For something where all candidates have a reasonably high probability
over the entire diagram, it wouldn't be as effective as you would have
mixing of colours.

However, for a method which gives the winner close to 100% for most of
the diagram, then only in the border regions would there be mixed
pixels.