Switched \VuFind\Connection\OpenLibrary to accept injected HTTP client; adjusted OpenLibrarySubjects recommendation module to perform injection.

Added CollectionSideFacets recommendation module and set it up to be active by default in collection view.

Made record router smart enough to figure out collection links even if not given a full record driver object.

Made record router a service rather than a static class to enable dependency injection and easier overriding.

Set up links to collection view rather than record view for appropriate records when collections are enabled.