The Webcam class is a type of Sprite that
shows a video image from the computer's webcam, if the user
gives permission.
To make a Webcam, use w = new Webcam. (Here w can be any variable
name we choose).
A webcam can be rotated and moved just like any other Sprite.
w = new Webcam w.rt 360 w.fd 100
To stop the webcam, use do w.cut.
w = new Webcam button 'stop', -> do w.cut