message: Remove `using namespace NAS2D;` from `RadioButton`
diff: #include "RadioButtonGroup.h"
  -using namespace NAS2D;
  -
  -
  RadioButtonGroup::RadioButton::RadioButton(RadioButtonGroup* parentContainer, std::string newText, NAS2D::Delegate<void()> delegate) :
  mFont{fontCache.load(constants::FONT_PRIMARY, constants::FontPrimaryNormal)},
  mSkin{imageCache.load("ui/skin/radio.png")},
  @@ -12,14 +9,14 @@ RadioButtonGroup::RadioButton::RadioButton(RadioButtonGroup* parentContainer, st
  {
  text(newText);
  mSignal.connect({delegate});
  - Utility<EventHandler>::get().mouseButtonDown().connect({this, &RadioButtonGroup::RadioButton::onMouseDown});
  + NAS2D::Utility<NAS2D::EventHandler>::get().mouseButtonDown().connect({this, &RadioButtonGroup::RadioButton::onMouseDown});
  onTextChange();
  }
  RadioButtonGroup::RadioButton::~RadioButton()
  {
  - Utility<EventHandler>::get().mouseButtonDown().disconnect({this, &RadioButtonGroup::RadioButton::onMouseDown});
  + NAS2D::Utility<NAS2D::EventHandler>::get().mouseButtonDown().disconnect({this, &RadioButtonGroup::RadioButton::onMouseDown});
  }
  @@ -56,7 +53,7 @@ const std::string& RadioButtonGroup::RadioButton::text() const
  void RadioButtonGroup::RadioButton::draw() const
  {
  - auto& renderer = Utility<Renderer>::get();
  + auto& renderer = NAS2D::Utility<NAS2D::Renderer>::get();
  const auto unselectedIconRect = NAS2D::Rectangle{0, 0, 13, 13};
  const auto selectedIconRect = NAS2D::Rectangle{13, 0, 13, 13};
  @@ -82,11 +79,11 @@ void RadioButtonGroup::RadioButton::onTextChange()
  }
  -void RadioButtonGroup::RadioButton::onMouseDown(EventHandler::MouseButton button, NAS2D::Point<int> position)
  +void RadioButtonGroup::RadioButton::onMouseDown(NAS2D::EventHandler::MouseButton button, NAS2D::Point<int> position)
  {
  if (!enabled() || !visible()) { return; }
  - if (button == EventHandler::MouseButton::Left && mRect.contains(position))
  + if (button == NAS2D::EventHandler::MouseButton::Left && mRect.contains(position))
  {
  mParentContainer->select(*this);
  mSignal();
  