When grabbed, the VO will slide on one of its axis when moved.
In desktop, the controls to move a slider grab type is using K and L.
Axis: X, Y, or Z. The axis on which the slider will move.
Max Length: The positional length of how far a slider can be fully extended to.
Initial Position (0-1): The normalized position that the slider will start in. .5 means the half-way point.
