Includes integration test.

Resolves VUFIND-663.

Renamed 'logger' service to 'VuFind\Logger' to avoid conflicts; updated all logger-dependent classes to use Zend\Log\LoggerAwareInterface; set up standard initializer for main service manager and other factories.

Prefixed plugin manager service names with "VuFind\" as first step toward best-practice naming for global services.

Use explicit dependency injection for ILS authentication module instead of relying on service locator.