Modernize most Conduit console interfaces

Summary:
Ref T603. Ref T2625.

Long chain of "doing the right thing" here: I want to clean this up, so I can clean up the Conduit logs, so I can add a setup issue for deprecated method calls, so I can remove deprecated methods, so I can get rid of `DifferentialRevisionListData`, so I can make Differntial policy-aware.

Adds modern infrastructure and UI to all of the Conduit interfaces (except only partially for the logs, that will be the next diff).

Test Plan:
{F48201}
{F48202}
{F48203}
{F48204}
{F48206}

This will get further updates in the next diff:

{F48205}

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T603, T2625

Differential Revision: https://secure.phabricator.com/D6331

src/applications/search/controller/PhabricatorApplicationSearchController.php

@@ -173,16 +173,17 @@ final class PhabricatorApplicationSearchController
 
       $pager = new AphrontCursorPagerView();
       $pager->readFromRequest($request);
+      $pager->setPageSize($engine->getPageSize($saved_query));
       $objects = $query->setViewer($request->getUser())
         ->executeWithCursorPager($pager);
 
       $list = $parent->renderResultsList($objects);
-      $list->setNoDataString(pht("No results found for this query."));
 
       $nav->appendChild($list);
 
       // TODO: This is a bit hacky.
       if ($list instanceof PhabricatorObjectItemListView) {
+        $list->setNoDataString(pht("No results found for this query."));
         $list->setPager($pager);
       } else {
         $nav->appendChild($pager);

src/applications/search/engine/PhabricatorApplicationSearchEngine.php

@@ -305,4 +305,14 @@ abstract class PhabricatorApplicationSearchEngine {
           ->setLabel($end_name)
           ->setValue($end_str));
   }
+
+
+/* -(  Pagination  )--------------------------------------------------------- */
+
+
+  public function getPageSize(PhabricatorSavedQuery $saved) {
+    return $saved->getParameter('limit', 100);
+  }
+
+
 }