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/app-routing.module.ts

@@ -56,6 +56,10 @@ const routes: Routes = [
         (mod) => mod.ModifierCategoriesModule,
       ),
   },
+  {
+    path: 'regimes',
+    loadChildren: () => import('./regimes/regimes.module').then((mod) => mod.RegimesModule),
+  },
   {
     path: 'printers',
     loadChildren: () => import('./printers/printers.module').then((mod) => mod.PrintersModule),