v 0.18: NavPolicyNextOnly... implemented

src/app/app.module.ts

src/app/test-controller/backend.service.ts

src/app/test-controller/test-controller.component.css

src/app/test-controller/test-controller.component.html

src/app/test-controller/test-controller.component.ts

src/app/test-controller/test-controller.interfaces.ts

src/app/test-controller/test-controller.module.ts

src/app/test-controller/test-controller.service.ts

src/app/test-controller/unithost/unit-routing-guards.ts

src/app/test-controller/unithost/unithost.component.ts

src/environments/environment.build.ts