CenterMode defines how an object should be placed when following the path.
TOP_LEFT
Align the x,y position of the object on the path.
CENTER
Align the midpoint of the object on the path.
ORIGIN
If the object is a FlxSprite, align its origin point on the path. If it is not a sprite it will use the position.
CUSTOM(offset:FlxPoint)
Uses the specified offset from the position.