Feature: Tax Regimes are added so that different bills with different series can be printed for Different regimes such as VAT and GST

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

bookie/src/app/sales/running-tables/running-tables.component.html

@@ -17,7 +17,7 @@
           table.guest
         }}</mat-card-subtitle>
         <span class="center"
-          >{{ table.pax || '-' }} / {{ table.seats }} / {{ table.section?.name }}</span
+          >{{ table.pax ?? '-' }} / {{ table.seats }} / {{ table.section?.name }}</span
         >
         <span class="center" *ngIf="table.date">{{ table.date }}</span>
         <span class="center" *ngIf="table.amount">{{ table.amount | currency : 'INR' }}</span>