Feature: Lazy loading

Lazy loaded everything
TODO: The cash flow module when clicking on sub-links, it reloads the whole page, it needs to be diagnosed and fixed, this problem also exists in the other modules
TODO: Rename folders and modules such as account to accounts to match the url

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

@@ -1,8 +1,8 @@
 import {Injectable} from '@angular/core';
 import {ActivatedRouteSnapshot, Resolve, RouterStateSnapshot} from '@angular/router';
 import {Observable} from 'rxjs/internal/Observable';
-import {Voucher} from '../journal/voucher';
-import {VoucherService} from '../journal/voucher.service';
+import {Voucher} from '../core/voucher';
+import {VoucherService} from '../core/voucher.service';
 
 @Injectable({
   providedIn: 'root'