refactor: Clients Module

- refactors clients-routing.module.ts for dynamic breadcrumbs.
- refactors clients.service.ts to use HttpClient
- adds resolver to load client data
- removes partially implemented components

fixes: #409

src/app/clients/create-client/create-client.component.spec.ts

@@ -1,25 +0,0 @@
-import { async, ComponentFixture, TestBed } from '@angular/core/testing';
-
-import { CreateClientComponent } from './create-client.component';
-
-describe('CreateClientComponent', () => {
-  let component: CreateClientComponent;
-  let fixture: ComponentFixture<CreateClientComponent>;
-
-  beforeEach(async(() => {
-    TestBed.configureTestingModule({
-      declarations: [ CreateClientComponent ]
-    })
-    .compileComponents();
-  }));
-
-  beforeEach(() => {
-    fixture = TestBed.createComponent(CreateClientComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
-});