implement automatic scoring

[codenrhoden]

The Team challenges/tasks should be implemented in such a way that at the completion of each task, there is a callback to the game server to verify that it is done. Then scoring can be automatic instead of manual, and it will also remove judges' interpretation from the mix.

Doing this will require more clearly defined achievements.

We will need to worry about security and verification -- how do we make sure that completion of the tasks is not faked?