Allow macros to have associated audio and audio behaviors

Summary: Ref T3887. Implements storage and editors, but not the actual audio part.

Test Plan: Edited audio, audio behaviors of macros. Transactions and email looked good. Hit error cases.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3887

Differential Revision: https://secure.phabricator.com/D7159
Implement macros as audio sources

Summary:
Fixes T3887. Basically:

  - Macros with audio get passed to the `audio-source` behavior.
  - This keeps track of where they are relative to the viewport as the user scrolls.
    - When the user scrolls a "once" macro into view, and it reaches roughly the middle of the screen, we play the sound.
    - When the user scrolls near a "loop" macro, we start playing the sound at low volume and increase the volume as the user scrolls.

This feels pretty good on both counts.

Test Plan: Tested in Safari, Chrome, and Firefox. FF seems a bit less responsive and doesn't support MP3, but it was fairly nice in Chrome/Safari.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3887

Differential Revision: https://secure.phabricator.com/D7160
Add "Subscribers" to Maniphest application search

Summary: Fixes T3883. This is already supported in the query, expose it in the UI.

Test Plan: Ran some queries with and without subscribers.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3883

Differential Revision: https://secure.phabricator.com/D7161
Fix two issues with audio macros

Summary:
Fixes T3887. Two issues:

  - Macros were generating entirely before the render cache, so audio macros worked fine in previews and the first time the cache was populated, but not afterward.
    - Instead, parse them before the cache but drop them in after the cache. Clean up all the file querying, too. This makes cached remarkup generate the correct audio beahviors.
  - Safari sends an HTTP request with a "Range" header, and expects a "206 Partial Content" response. If we don't give it one, it sometimes has trouble figuring out how long a piece of audio is (mostly for longer clips? Or mostly for MP3s?). I'm not exactly sure what triggers it. The net effect is that "loop" does not work when Safari gets confused. While looping a short "quack.wav" worked fine, longer MP3s didn't loop.
    - Supporting "Range" and "206 Partial Content", which is straightforward, fixes this problem.

Test Plan:
  - Viewed a page with lots of different cached audio macros and lots of different uncached preview audio macros, they all rendered correctly and played audio.
  - Viewed a macro with a long MP3 audio loop in Safari. Verified it looped after it completed. Used Charles to check that the server received and responded to the "Range" header correctly.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3887

Differential Revision: https://secure.phabricator.com/D7166
Add objectheaders to new View

Summary: This adds the 'PHUIObjectBox' to nearly every place that should get it. I need to comb through Diffusion a little more. I've left Differential mostly alone, but may decide to do it anyways this weekend. I'm sure I missed something else, but these are easy enough to update.

Test Plan: tested each new layout.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7162
ObjectBoxView for Open Revisions

Summary: Missed this case in my sandbox

Test Plan: Reload a test diff

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7168