Instructions from GT: inspect the html on the browser - the small circle is the handle that lets the
user choose a viewing angle. Its id is "eye-control-handle" - you can use a socket to respond to
the event of mouse release - any time the user is done changing the angle, the session variable gets
updated with the angle (just call the function getAngle());
You should import eyeplot.js without changing it and handle all the other logic in game7.js