Drive all Celerity operations from the new map

Summary:
Ref T4222.

• Removes the old map and changes the CelerityResourceMap API to be entirely driven by the new map.
• The new map is about 50% smaller and organized more sensibly.
• This removes the /pkg/ URI component. All resources are now required to have unique names, so we can tell if a resource is a package or not by looking at the name.
• Removes some junky old APIs.
• Cleans up some other APIs.
• Added some feedback for bin/celerity map.
• CelerityResourceMap is still a singleton which is inextricably bound to the Phabricator map; this will change in the future.

Test Plan:

• Reloaded pages.
• Verified packaging works by looking at generated includes.
• Forced minification on and verified it worked.
• Forced no-timestamps on and verified it worked.
• Rebuilt map.
• Ran old script and verified error message.
• Checked logs.

Reviewers: btrahan, hach-que

Reviewed By: hach-que

CC: chad, aran

Maniphest Tasks: T4222

Differential Revision: https://secure.phabricator.com/D7872