Prettied, Linted and updated angular.json according to the latest schematic of Angular CLI.

Now all that is needed is to make it ready for strict compiling.
Removed eslint-plugin-prettier as it is not recommended and causes errors for both eslint and prettier

Bumped to v8.0.0

overlord/src/app/payment/payment-resolver.service.ts

@@ -1,6 +1,7 @@
 import { Injectable } from '@angular/core';
-import { ActivatedRouteSnapshot, Resolve, RouterStateSnapshot } from '@angular/router';
+import { ActivatedRouteSnapshot, Resolve } from '@angular/router';
 import { Observable } from 'rxjs/internal/Observable';
+
 import { Voucher } from '../core/voucher';
 import { VoucherService } from '../core/voucher.service';
 
@@ -10,15 +11,15 @@ import { VoucherService } from '../core/voucher.service';
 export class PaymentResolver implements Resolve<Voucher> {
   constructor(private ser: VoucherService) {}
 
-  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Voucher> {
+  resolve(route: ActivatedRouteSnapshot): Observable<Voucher> {
     const id = route.paramMap.get('id');
     const account = route.queryParamMap.get('a') || null;
     if (id !== null) {
       return this.ser.get(id, 'Payment');
-    } else if (account !== null) {
-      return this.ser.getOfType('Payment', account);
-    } else {
-      return this.ser.getOfType('Payment');
     }
+    if (account !== null) {
+      return this.ser.getOfType('Payment', account);
+    }
+    return this.ser.getOfType('Payment');
   }
 }