Make search form and results view use nuxeo-results instead of view

Right now every nuxeo-results element sends a document-level event notifying every time a view changes, and every instance of nuxeo-search-forms and nuxeo-results-view register a listener for this event and update a local property every time a view from a `nuxeo-results` element with the same sarchName changes. But this view is only used for fetching and reseting, and these methods can be made available on the nuxeo-result itself, which would save us several property changes.