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/infrastructure/diff/interface/PhabricatorInlineCommentInterface.php

@@ -0,0 +1,54 @@
+<?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.
+ */
+
+/**
+ * Shared interface used by Differential and Diffusion inline comments.
+ */
+interface PhabricatorInlineCommentInterface {
+
+  public function setChangesetID($id);
+  public function getChangesetID();
+
+  public function setIsNewFile($is_new);
+  public function getIsNewFile();
+
+  public function setLineNumber($number);
+  public function getLineNumber();
+
+  public function setLineLength($length);
+  public function getLineLength();
+
+  public function setContent($content);
+  public function getContent();
+
+  public function setCache($cache);
+  public function getCache();
+
+  public function setAuthorPHID($phid);
+  public function getAuthorPHID();
+
+  public function setSyntheticAuthor($synthetic_author);
+  public function getSyntheticAuthor();
+
+  public function isCompatible(PhabricatorInlineCommentInterface $inline);
+  public function isDraft();
+
+  public function save();
+  public function delete();
+
+}