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/incentive/incentive-resolver.service.ts

@@ -1,9 +1,9 @@
 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';
-import { tap } from 'rxjs/operators';
 
 @Injectable({
   providedIn: 'root',
@@ -11,12 +11,11 @@ import { tap } from 'rxjs/operators';
 export class IncentiveResolver 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');
     if (id === null) {
       return this.ser.getOfType('Incentive');
-    } else {
-      return this.ser.get(id, 'Incentive');
     }
+    return this.ser.get(id, 'Incentive');
   }
 }