closes #1: Favorite buttons has been extended with category buttons.

commodity/data/commoditytypedata.cpp

@@ -7,6 +7,7 @@ namespace qx {
         t.setName("CommodityTypeData");
         t.id(&CommodityTypeData::m_id, "id");
         t.data(&CommodityTypeData::m_name, "name");
+        t.data(&CommodityTypeData::m_color, "color");
     }
 }
 
@@ -47,4 +48,12 @@ QString CommodityTypeData::toString()
     return this->name();
 }
 
+QString CommodityTypeData::color() const {
+    return m_color;
+}
+
+void CommodityTypeData::setColor(const QString& color) {
+    m_color = color;
+}
+