Gets the coordinate information of the specified index from the current touch coordinate array.
The number of coordinates can be obtained with the Window.touchPointCount property.
Coordinate information is returned in a dictionary containing the following elements: startX : X coordinate value (client coordinate system) of the start coordinate of this touch startY : Y coordinate of the start coordinate of this touch (client coordinate system) x : The x coordinate value (client coordinate system) of the current coordinate of this touch y : The y coordinate value (client coordinate system) of the current coordinate of this touch ID : ID for identifying this touch