Events#onInputUp

This signal is dispatched if the Game Object has inputEnabled set to true,
and receives an up event from a Phaser.Pointer. This effectively means the Pointer had been
pressed down, and was then released on the Game Object.
It is sent three arguments:
{any} The Game Object that received the event.
{Phaser.Pointer} The Phaser.Pointer object that caused the event.
{boolean} isOver - Is the Pointer still over the Game Object?