Fix: DiscountLimit was not scaled to 100 in MenuCategory detail. So it is now chaled in the json and scaled back in the frontend for the list as that was not supposed to be scaled.
Feature: Modifier is now done
Fix: In product save, it was checking menu_category second time again instead of sale_category
Extracted Product Group -> Group_type to a a new object called Sale Category.
Moved tax from product to Sale Category for uniform taxes on types of sales.
