message: Remove `using namespace NAS2D;` from `UIContainer`
diff: #include <stdexcept>
  -using namespace NAS2D;
  -
  -
  UIContainer::UIContainer() : UIContainer{{}}
  {
  }
  @@ -19,13 +16,13 @@ UIContainer::UIContainer() : UIContainer{{}}
  UIContainer::UIContainer(std::vector<Control*> controls) :
  mControls{std::move(controls)}
  {
  - Utility<EventHandler>::get().mouseButtonDown().connect({this, &UIContainer::onMouseDown});
  + NAS2D::Utility<NAS2D::EventHandler>::get().mouseButtonDown().connect({this, &UIContainer::onMouseDown});
  }
  UIContainer::~UIContainer()
  {
  - Utility<EventHandler>::get().mouseButtonDown().disconnect({this, &UIContainer::onMouseDown});
  + NAS2D::Utility<NAS2D::EventHandler>::get().mouseButtonDown().disconnect({this, &UIContainer::onMouseDown});
  }
  @@ -87,7 +84,7 @@ void UIContainer::onMove(NAS2D::Vector<int> displacement)
  }
  -void UIContainer::onMouseDown(EventHandler::MouseButton /*button*/, NAS2D::Point<int> position)
  +void UIContainer::onMouseDown(NAS2D::EventHandler::MouseButton /*button*/, NAS2D::Point<int> position)
  {
  if (!visible()) { return; }
  @@ -121,7 +118,7 @@ void UIContainer::update()
  /*
  if (control->hasFocus())
  {
  - Utility<Renderer>::get().drawBox(control->rect(), 255, 0, 255);
  + NAS2D::Utility<NAS2D::Renderer>::get().drawBox(control->rect(), 255, 0, 255);
  }
  */
  }
  