Implemented base functionality for commodity grid on shop form.

shop/shopform.h

@@ -6,6 +6,8 @@
 #include "data/shop-data.h"
 #include <autotablemodel.h>
 
+class ShopItem;
+
 namespace Ui {
 class ShopForm;
 }
@@ -41,6 +43,7 @@ private:
     Ui::ShopForm *ui;
     QSharedPointer<Voucher> m_voucher;
     AutoTableModel<VoucherItem> *m_itemsModel;
+    AutoTableModel<ShopItem> *m_commodityModel;
 
     void createVoucher();
     void doTempSave(bool comboChanged);