Implement a simple scoring system

[ecridge]

Implement a simple scoring system that lets you choose which team was the winner (or if there was a draw) at the end of each match. At the end of each session display a score histogram showing the winning teams.

It's probably best to use an all positive system like 3 for a win and 1 for a draw so that at the end you can just ignore any teams with score zero (i.e. because they weren't scoring or didn't report their scores to the box). Also don't bother displaying any score information if no teams are being scored.