Created plugin manager for ILS drivers; refactored \VuFind\ILS\Connection to use plugin manager and receive injected configuration; created temporary service locator workaround for \VuFind\Connection\Manager until the class can be completely factored out.

Improved search manager integration for ExpandFacets recommendation module; also eliminated explicit \VuFind namespace reference in template.

Cleaned up some recommendation modules so they do not rely on $this->results already being set in the global context -- it is now pulled explicitly from the recommendation object.

Simplified Solr autocomplete subclasses and adjusted base class to use Search Manager and to disable recommendations for better performance.

Introduced \VuFind\Search\Manager; began using it to replace \VuFind\Search\Options (refactoring still in progress).

Standardized plugin manager initialization to make subsequent additions easier; added support for service locator injection.

Created abstract base class for Cart helper so we can create other service locator based view helpers.