Sets the given joystick's label sprite.
PRVirconJoySetLabel(joyId, sprite, xOffsetX, yOffset, scale, rotation) 
The joystick ID.
The sprite to use for the joystick's label.
The x-offset of the label sprite from the center of the joystick's nub.
The y-offset of the label sprite from the center of the joystick's nub.
The scale size to apply to the label sprite with 1 being normal size.
The angle at which to draw the label sprite.
n/a