message: Rename `area` to `newRect` in `Control::area`
diff: #include "Control.h"
  -void Control::area(const NAS2D::Rectangle<int>& area)
  +void Control::area(const NAS2D::Rectangle<int>& newRect)
  {
  - const auto displacement = area.startPoint() - mRect.startPoint();
  - mRect = area;
  + const auto displacement = newRect.startPoint() - mRect.startPoint();
  + mRect = newRect;
  onMove(displacement);
  onResize();
  }
  