Chore: Model relationships updated to make them simpler
Chore: Bill printing majorly refactored for it
Due to the sheer depth of the changes. There can be showstoppers. Please test it carefully
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