Remove subprojects from the Projects UI and API

Summary:
These are currently useless and confusing (they have no application impact), and should be migrated to edges if we want to restore them in some form.

I left the actual storage so this doesn't destroy any data, it just removes all traces of this feature from the UI.

Test Plan: Looked at and edited projects.

Reviewers: vrana, btrahan

Reviewed By: vrana

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D3183

src/applications/project/controller/PhabricatorProjectProfileEditController.php

@@ -39,15 +39,6 @@ final class PhabricatorProjectProfileEditController
 
     $img_src = $profile->loadProfileImageURI();
 
-    if ($project->getSubprojectPHIDs()) {
-      $phids = $project->getSubprojectPHIDs();
-      $handles = id(new PhabricatorObjectHandleData($phids))
-        ->loadHandles();
-      $subprojects = mpull($handles, 'getFullName', 'getPHID');
-    } else {
-      $subprojects = array();
-    }
-
     $options = PhabricatorProjectStatus::getStatusMap();
 
     $affiliations = $project->loadAffiliations();
@@ -84,7 +75,6 @@ final class PhabricatorProjectProfileEditController
         $errors[] = $ex->getMessage();
       }
 
-      $project->setSubprojectPHIDs($request->getArr('set_subprojects'));
       $profile->setBlurb($request->getStr('blurb'));
 
       if (!strlen($project->getName())) {
@@ -249,12 +239,6 @@ final class PhabricatorProjectProfileEditController
           ->setLabel('Blurb')
           ->setName('blurb')
           ->setValue($profile->getBlurb()))
-      ->appendChild(
-        id(new AphrontFormTokenizerControl())
-          ->setDatasource('/typeahead/common/projects/')
-          ->setLabel('Subprojects')
-          ->setName('set_subprojects')
-          ->setValue($subprojects))
       ->appendChild(
         id(new AphrontFormMarkupControl())
           ->setLabel('Profile Image')