message: Remove deduction of SliderType from Slider control size
  This property really shouldn't change after construction.
diff: @@ -53,16 +53,6 @@ Slider::~Slider()
  void Slider::size(NAS2D::Vector<float> size)
  {
  Control::size(size);
  -
  - // deduce the type of slider from the ratio.
  - if (mRect.height() > mRect.width())
  - {
  - mSliderType = SliderType::Vertical;
  - }
  - else
  - {
  - mSliderType = SliderType::Horizontal;
  - }
  }
  