Updated to angular 10

Moved to eslint for linting
Added prettier for formatting
Fixed minor errors

bookie/src/app/sales/bills/bills.component.ts

@@ -31,7 +31,7 @@ export class BillsComponent implements OnInit {
     private dialog: MatDialog,
     private toaster: ToasterService,
     private auth: AuthService,
-    private bs: BillService,
+    public bs: BillService,
     private tSer: TableService
   ) {
   }