Method removeAllItems

Common/PanelView/BasePanelView.h:123–133

Remove all items

		//! Remove all items
		void removeAllItems()
		{
			for (auto& item : mItems)
			{
				BasePanelViewCell* cell = item->getPanelCell();
				item->_shutdown();
				delete cell;
			}
			mItems.clear();
			setNeedUpdate();
		}

		void updateView()
		{