Set up record loader to use Search Manager for class name determination; added alias to account for legacy VuFind source value in database.

Refactored VuFind\Record\Loader as an instance rather than a collection of static methods (in preparation for service locator integration).

1. fixed bug where Search Manager would load incorrect objects because state had been changed in between calls (i.e. $params object may use Search Manager, changing its state before $results object can be created -- to avoid, we need more explicit calls to setSearchClassId())

2. refactored record drivers in preparation for plugin manager (moved constructor parameter to setRawData method).  This allowed more common functionality to be moved to the abstract base class.  Renamed getAllFields() to getRawData() for consistency.

Small bonus change: turned off highlighting/spellchecking/recommendations in BrowseController for improved performance.

Eliminated unnecessary session assignments in logsql mode; did some refactoring to make fixdatabaseAction() slightly shorter and more readable.

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).