Get a point on a line that's a given percentage along its length.
A value between 0 and 1, where 0 is the start, 0.5 is the middle and 1 is the end of the line.
|out||object | Phaser.Geom.Point||<optional>||
An optional point, or point-like object, to store the coordinates of the point on the line.
The point on the line.