Begin construction of bin/celerity map

Summary:
Ref T4222. Moves us toward a more modern Celerity CLI, and moves map discovery into the classtree. This is a little bit bulky (and means you can't ship completely standalone celerity maps) but has the advantage of being completely standard, and we could subclass maps into an auto-discovering map later if we have a need for it.

This doesn't affect the existing Celerity stuff. I'm going to build the new stuff in parallel, and then swap us over at the end.

Test Plan: Ran `bin/celerity map`, got reasonable-looking output.

Reviewers: btrahan, hach-que

Reviewed By: hach-que

CC: aran

Maniphest Tasks: T4222

Differential Revision: https://secure.phabricator.com/D7864

scripts/setup/manage_celerity.php

@@ -0,0 +1,21 @@
+#!/usr/bin/env php
+<?php
+
+$root = dirname(dirname(dirname(__FILE__)));
+require_once $root.'/scripts/__init_script__.php';
+
+$args = new PhutilArgumentParser($argv);
+$args->setTagline('manage celerity');
+$args->setSynopsis(<<<EOSYNOPSIS
+**celerity** __command__ [__options__]
+    Manage static resources.
+
+EOSYNOPSIS
+  );
+$args->parseStandardArguments();
+
+$workflows = id(new PhutilSymbolLoader())
+  ->setAncestorClass('CelerityManagementWorkflow')
+  ->loadObjects();
+$workflows[] = new PhutilHelpArgumentWorkflow();
+$args->parseWorkflows($workflows);