give players a star ranking

[mwcz]

To give players a feeling of completion, display a star ranking at the end of the game.

I set a benchmark by typing in as many HTML tags as I could, going by the list.
I was able to type in 89 commands and got a score of approx 140,000.

That was at high speed going from a list with no downtime for thinking, so it's
definitely an upper bound. I'm thinking a more realistic number would be 30 commands, one star per 6 commands.