Move files in Phabricator one level up

Summary:
- `kill_init.php` said "Moving 1000 files" - I hope that this is not some limit in `FileFinder`.
- [src/infrastructure/celerity] `git mv utils.php map.php; git mv api/utils.php api.php`
- Comment `phutil_libraries` in `.arcconfig` and run `arc liberate`.

NOTE: `arc diff` timed out so I'm pushing it without review.

Test Plan:
/D1234
Browsed around, especially in `applications/repository/worker/commitchangeparser` and `applications/` in general.

Auditors: epriestley

Maniphest Tasks: T1103

src/applications/files/controller/PhabricatorFileDropUploadController.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class PhabricatorFileDropUploadController
+  extends PhabricatorFileController {
+
+  public function processRequest() {
+    $request = $this->getRequest();
+    $user = $request->getUser();
+
+    // NOTE: Throws if valid CSRF token is not present in the request.
+    $request->validateCSRF();
+
+    $data = file_get_contents('php://input');
+    $name = $request->getStr('name');
+
+    $file = PhabricatorFile::newFromXHRUpload(
+      $data,
+      array(
+        'name' => $request->getStr('name'),
+        'authorPHID' => $user->getPHID(),
+      ));
+
+    $view = new AphrontAttachedFileView();
+    $view->setFile($file);
+
+    return id(new AphrontAjaxResponse())->setContent(
+      array(
+        'id'   => $file->getID(),
+        'phid' => $file->getPHID(),
+        'html' => $view->render(),
+        'uri'  => $file->getBestURI(),
+      ));
+  }
+
+}