Input event type for screen touch events.
(only available on mobile devices)
Stores multi-touch press/release information. Supports touch press, touch release and [member index] for multi-touch count and order.
http://docs.godotengine.org/en/stable/learning/features/inputs/inputevent.html
Touch index in the case of a multi-touch event. One index = one finger.
Touch position.
If [code]true[/code] the touch's state is pressed. If [code]false[/code] the touch's state is released.