Separate handle "status" and "availability"

Summary:
Ref T7707. Handles currently have a "status" field and a "disabled" field.

The "status" field has these possible values: "open", "closed", "1", "2". durp durp durp

Instead, do:

  - status = <open, closed>
  - availability = <full, partial, none, disabled>

I think these make more sense? And are a bit more general? And use the same kind of constants for all values!

Test Plan: Looked at all affected handles in all states (probably).

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7707

Differential Revision: https://secure.phabricator.com/D12832

src/applications/phriction/phid/PhrictionDocumentPHIDType.php

@@ -42,7 +42,7 @@ final class PhrictionDocumentPHIDType extends PhabricatorPHIDType {
       $handle->setURI(PhrictionDocument::getSlugURI($slug));
 
       if ($status != PhrictionDocumentStatus::STATUS_EXISTS) {
-        $handle->setStatus(PhabricatorObjectHandleStatus::STATUS_CLOSED);
+        $handle->setStatus(PhabricatorObjectHandle::STATUS_CLOSED);
       }
     }
   }