message: Replace `pointInRect_f` with `contains` in UIContainer
  The new code is more clear there is a conversion to integer before
  checking for if the rect contains the point.
diff: @@ -127,7 +127,7 @@ void UIContainer::onMouseDown(EventHandler::MouseButton /*button*/, int x, int y
  for (auto it = mControls.rbegin(); it != mControls.rend(); ++it)
  {
  control = (*it);
  - if (control->visible() && pointInRect_f(x, y, control->rect()))
  + if (control->visible() && control->rect().to<int>().contains(NAS2D::Point{x, y}))
  {
  if (control == mControls.back()) { return; }
  bringToFront(control);
  