Make most Differential reads policy-aware

Summary: Ref T603. Makes the majority of reads policy aware (and pretty much all the important ones).

Test Plan:
  - Created a comment with `differential.createcomment`.
  - Created a new revision with `arc diff` in order to exercise `differential.creatediff`.
  - Created an inline comment with `differential.createinline`.
  - Added a comment to a revision.
  - Edited an inline comment.
  - Edited a revision.
  - Wrote "Depends on ..." in a summary, saved, verified link was created.
  - Browsed a file in Diffusion.
  - Got past the code I changed in the Releeph request thing.
  - Edited a Releeph request.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7136

src/applications/search/controller/PhabricatorSearchSelectController.php

@@ -93,6 +93,7 @@ final class PhabricatorSearchSelectController
 
     switch ($this->type) {
       case DifferentialPHIDTypeRevision::TYPECONST:
+        // TODO: (T603) See below. This whole thing needs cleanup.
         $objects = id(new DifferentialRevision())->loadAllWhere(
           'id IN (%Ld)',
           $object_ids);