Improve implementation of ManiphestTaskQuery

Summary:
Currently, we have a single `projectPHIDs` field, and a separate flag which makes it act like AND or OR.

This is silly. Make two separate methods for setting `AND` vs `OR` projects. This also simplifies the implmentation.

This doesn't change the UI or any behavior (yet), it just makes the API more usable.

Test Plan: Loaded homepage, "All Projects" task view, verified queries made sense and returned correct results. Grepped for changed method name.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1610

Differential Revision: https://secure.phabricator.com/D3630

src/applications/directory/controller/PhabricatorDirectoryMainController.php

@@ -247,8 +247,7 @@ final class PhabricatorDirectoryMainController
       $task_query = new ManiphestTaskQuery();
       $task_query->withStatus(ManiphestTaskQuery::STATUS_OPEN);
       $task_query->withPriority(ManiphestTaskPriority::PRIORITY_TRIAGE);
-      $task_query->withProjects(mpull($projects, 'getPHID'));
-      $task_query->withAnyProject(true);
+      $task_query->withAnyProjects(mpull($projects, 'getPHID'));
       $task_query->setLimit(10);
       $tasks = $task_query->execute();
     } else {