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/purchase-entries/purchase-entries.service.ts

@@ -9,7 +9,7 @@ const httpOptions = {
   headers: new HttpHeaders({'Content-Type': 'application/json'})
 };
 
-const url = '/api/PurchaseEntries';
+const url = '/api/purchase-entries';
 const serviceName = 'PurchaseEntriesService';
 
 @Injectable({