Trivially implement RepositoryEditEngine and API methods

Summary: Ref T10748. Ref T10337. This technically implements this stuff, but it does not do anything useful yet. This skips all the hard stuff.

Test Plan:
  - Technically used `diffusion.repository.search` to get repository information.
  - Technically used `diffusion.repository.edit` to change a repository name.
  - Used `editpro/` to edit a repository name.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10337, T10748

Differential Revision: https://secure.phabricator.com/D15736

src/applications/diffusion/controller/DiffusionRepositoryEditproController.php

@@ -0,0 +1,12 @@
+<?php
+
+final class DiffusionRepositoryEditproController
+  extends DiffusionRepositoryEditController {
+
+  public function handleRequest(AphrontRequest $request) {
+    return id(new DiffusionRepositoryEditEngine())
+      ->setController($this)
+      ->buildResponse();
+  }
+
+}