message: Inline and remove type alias ListBoxItems
diff: @@ -35,8 +35,6 @@ public:
  bool operator<(const ListBoxItem& lhs) { return text < lhs.text; }
  };
  - using ListBoxItems = std::vector<ListBoxItem>;
  -
  ListBox();
  ~ListBox() override;
  @@ -94,7 +92,7 @@ private:
  unsigned int mLineHeight = 0; /**< Height of an item line. */
  unsigned int mLineCount = 0; /**< Number of lines that can be displayed. */
  - ListBoxItems mItems; /**< List of items preserved in the order in which they're added. */
  + std::vector<ListBoxItem> mItems; /**< List of items preserved in the order in which they're added. */
  NAS2D::Color mText = NAS2D::Color::White; /**< Text Color */
  NAS2D::Color mHighlightBg = NAS2D::Color::DarkGreen; /**< Highlight Background color. */
  