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/cost-centre/cost-centre-list/cost-centre-list.component.ts

@@ -2,7 +2,7 @@ import {Component, OnInit, ViewChild} from '@angular/core';
 import { MatPaginator } from '@angular/material/paginator';
 import { MatSort } from '@angular/material/sort';
 import {CostCentreListDataSource} from './cost-centre-list-datasource';
-import {CostCentre} from '../cost-centre';
+import {CostCentre} from '../../core/cost-centre';
 import {ActivatedRoute} from '@angular/router';
 
 @Component({