Removed unused slot and added more information to the history entry. References #5296.

   *   @history 2018-07-31 Tracie Sucharski - Add accessor method for ImageFileListWidget.

   *   @history 2018-08-10 Tracie Sucharski - Added new slot connected from ProjectItemProxyModel's

   *                           itemsAdded signal which is emitted after all selected items have

   *                           been added to the proxy model.  This allows the FootprintView to put

   *                           all selected items into the scene widget at once rather than

   *                           individually which speeds the display of footprints. Fixes #5296.

   *                           been added to the proxy model.  The images are added to a new private

   *                           member as each item is added to the model through the slot,

   *                           onItemAdded. This allows the FootprintView to put all selected items

   *                           into the scene widget at once rather than individually which speeds

   *                           the display of footprints. Fixes #5296.

   *  

   */

  class Footprint2DView : public AbstractProjectItemView {

    protected:

      bool eventFilter(QObject *watched, QEvent *event);

    protected slots:

      //void rowsInserted(const QModelIndex &parent, int first, int last);

    private slots:

      void onItemAdded(ProjectItem *item);

      void onItemsAdded();