message: Remove `using namespace NAS2D;` from `ScrollBar`
diff: #include <algorithm>
  -using namespace NAS2D;
  -
  -
  namespace
  {
  ScrollBar::Skins loadSkins(ScrollBar::ScrollBarType scrollBarType)
  @@ -126,7 +123,7 @@ ScrollBar::ScrollBar(ScrollBar::Skins skins, ScrollBarType scrollBarType) :
  mScrollBarType{scrollBarType},
  mSkins{skins}
  {
  - auto& eventHandler = Utility<EventHandler>::get();
  + auto& eventHandler = NAS2D::Utility<NAS2D::EventHandler>::get();
  eventHandler.mouseButtonDown().connect({this, &ScrollBar::onMouseDown});
  eventHandler.mouseButtonUp().connect({this, &ScrollBar::onMouseUp});
  eventHandler.mouseMotion().connect({this, &ScrollBar::onMouseMove});
  @@ -135,7 +132,7 @@ ScrollBar::ScrollBar(ScrollBar::Skins skins, ScrollBarType scrollBarType) :
  ScrollBar::~ScrollBar()
  {
  - auto& eventHandler = Utility<EventHandler>::get();
  + auto& eventHandler = NAS2D::Utility<NAS2D::EventHandler>::get();
  eventHandler.mouseButtonDown().disconnect({this, &ScrollBar::onMouseDown});
  eventHandler.mouseButtonUp().disconnect({this, &ScrollBar::onMouseUp});
  eventHandler.mouseMotion().disconnect({this, &ScrollBar::onMouseMove});
  @@ -198,7 +195,7 @@ void ScrollBar::update()
  void ScrollBar::draw() const
  {
  - auto& renderer = Utility<Renderer>::get();
  + auto& renderer = NAS2D::Utility<NAS2D::Renderer>::get();
  mSkins.skinTrack.draw(renderer, mTrack);
  mSkins.skinThumb.draw(renderer, mThumb);
  @@ -217,11 +214,11 @@ void ScrollBar::onButtonClick(bool& buttonFlag, ValueType value)
  }
  -void ScrollBar::onMouseDown(EventHandler::MouseButton button, NAS2D::Point<int> position)
  +void ScrollBar::onMouseDown(NAS2D::EventHandler::MouseButton button, NAS2D::Point<int> position)
  {
  if (!enabled() || !visible()) { return; }
  - if (button == EventHandler::MouseButton::Left)
  + if (button == NAS2D::EventHandler::MouseButton::Left)
  {
  if (mThumb.contains(position))
  {
  @@ -239,9 +236,9 @@ void ScrollBar::onMouseDown(EventHandler::MouseButton button, NAS2D::Point<int>
  }
  -void ScrollBar::onMouseUp(EventHandler::MouseButton button, NAS2D::Point<int> position)
  +void ScrollBar::onMouseUp(NAS2D::EventHandler::MouseButton button, NAS2D::Point<int> position)
  {
  - if (button != EventHandler::MouseButton::Left) { return; }
  + if (button != NAS2D::EventHandler::MouseButton::Left) { return; }
  mButtonDecreaseHeld = false;
  mButtonIncreaseHeld = false;
  