message: Add ability to get and set Control size as Vector
diff: @@ -54,6 +54,9 @@ public:
  const std::string& text() const;
  TextChangedCallback& textChanged();
  + NAS2D::Vector<float> size() const { return mRect.size(); }
  + void size(NAS2D::Vector<float> newSize) { size(newSize.x, newSize.y); }
  +
  void size(float _s);
  void size(float w, float h);
  