screen.listen()
must be called after your methods in your program!mousedown
| When the mouse is pressed or is held, this will be calledmouseup
| When the mouse is released this is calledmousedrag
| When the mouse is dragged, this is called anytime the mouse moves and is held.mousemove
| When the mouse moves, this method is called.keydown
| When a key is pressed or is currently being held, this is calledkeyup
| When a key is released this is called