Tweak mobile timeline

Summary: Improves timeline legebility by pulling date inline with title in timeline mobile.

Test Plan: shrink screen for a task, see new layout

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7236
Make Herald rules obey policies during application

Summary:
Ref T603. This closes the other major policy loophole in Herald, which was that you could write a rule like:

  When [Always], [Add me to CC]

...and end up getting email about everything. These rules are now enforced:

  - For a //personal// rule to trigger, you must be able to see the object, and you must be able to use the application the object exists in.
  - In contrast, //global// rules will //always// trigger.

Also fixes some small bugs:

  - Policy control access to thumbnails was overly restrictive.
  - The Pholio and Maniphest Herald rules applied only the //last// "Add CC" or "Add Project" rules, since each rule overwrote previous rules.

Test Plan:
  - Created "always cc me" herald and maniphest rules with a normal user.
  - Created task with "user" visibility, saw CC.
  - Created task with "no one" visibility, saw no CC and error message in transcript ("user can't see the object").
  - Restricted Maniphest to administrators and created a task with "user" visibility. Same deal.
  - Created "user" and "no one" mocks and saw CC and no CC, respectively.
  - Thumbnail in Pholio worked properly.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7224
Add a `(dst, type, src)` key to Differential's edge table

Summary:
Ref T1279. This came to me in a dream.

The existing `differential_relationship` table has an `(objectPHID, type)` column, which theoretically is useful for queries like "revisions with X as a reviewer". In practice, I'm not sure it gets used much, but I can get it to show up in at least some query plans.

Add a similar index to the `edge` table. This sequences //before// D7227, which actually migrates the data.

Test Plan:
  - Ran `bin/storage upgrade`.
  - EXPLAIN'd a bunch of queries against different versions of the schema, this seemed helpful overall.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1279

Differential Revision: https://secure.phabricator.com/D7232

Conflicts:
	src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
Migrate all Differential reviewer data to edges

Summary:
Ref T1279. @champo did a lot of this work already; we've been doing double writes for a long time.

Add "double reads" (reading the edge table as both the "relationship" table and as the "reviewer status" table), and migrate all the data.

I'm not bothering to try to recover old reviewer status (e.g., we could infer from transactions who accepted old revisions) because it wold be very complicated and doesn't seem too valuable.

Test Plan:
  - Without doing the migration, used Differential. Verified that reads and writes worked. Most of the data was there anyway since we've been double-writing.
  - Performed the migration. Verified that everything was still unchanged.
  - Dropped the edge table, verified all reviweer data vanished.
  - Migrated again, verified the reviewer stuff was restored.
  - Did various cc/reviewer/subscriber queries, got consistent results.

Reviewers: btrahan

Reviewed By: btrahan

CC: champo, aran

Maniphest Tasks: T1279

Differential Revision: https://secure.phabricator.com/D7227