Allow Phabricator to accept Conduit requests signed with an SSH key

Summary:
Ref T4209.  Depends on D10402.

This updates Conduit to support authenticating calls from other servers by signing the request parameters with the sending server's private key and verifying it with the public key stored in the database.

Test Plan:
  - Made like 500 bad calls using the stuff in D10402.
  - Made a few valid calls using the stuff in D10402.

Reviewers: hach-que, btrahan, #blessed_reviewers

Reviewed By: btrahan, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T6240, T4209

Differential Revision: https://secure.phabricator.com/D10401
Don't add "To/Cc" to HTML mail bodies if there's no HTML mail body

Summary: Ref T6576. This avoids generating almost-empty HTML mail bodies for mail which incorrectly has no HTML body.

Test Plan: Generated some mail locally; the specific hook case is a pain for me to hit right now. Will push and dig in if that doesn't fix it.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T6576

Differential Revision: https://secure.phabricator.com/D10863
Clean up Multirow Manager UI

Summary: Fixes T4234 (Policy and Herald). I will have an additional diff for Maniphest Batch Editor, which looks jank in many other ways.

Test Plan:
Test editing a policy and some herald rules. Stuff lines up better.

{F235086}

{F235087}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T4234

Differential Revision: https://secure.phabricator.com/D10864
Differential - stop showing the shield for "move away" operations

Summary: The shield is just confusing. In one case it doesn't work, and in the other case it just shows you a copy of the file you can see just below except in red. Fixes T4599, T1211. Note T1211 proposed not showing the "move away" file **at all** but I think removing the shield fixes the source of confusion. The code here is a bit if / else if / else if... heavy but this is logically sound.

Test Plan: made a diff where i moved a file then edited it in the new location. viewed diff, saw confusing shield, dropped caches, applied patch, viewed diff and saw no shield. made a diff where I moved a file and didn't edit in new location and saw similar shield disappearness.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T1211, T4599

Differential Revision: https://secure.phabricator.com/D10865
Search Typeahead - make exact matches show up first

Summary: Fixes T6102. Give "priority" treatment to strings that are exact matches.

Test Plan:
made a bunch of projects with the word project in them including "Project". before patch, "Project" wouldn't even show up if I typed "Project" - now its the second result right after the application "Projects".

{F235120}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6102

Differential Revision: https://secure.phabricator.com/D10867
Process Remarkup in text and HTML email bodies appropriately

Summary: Ref T6343, adding HTMLMailMode to remarkup, and most objects should now be processed and appear pretty in emails.

Test Plan: Add a comment to a Maniphest task containing a mention of an object like '{T1}' or 'T1'. Emails should show a styled version of the object similar to how the object looks in the context of the Maniphest task in the UI.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: chad, Korvin, epriestley

Maniphest Tasks: T6343, T2617

Differential Revision: https://secure.phabricator.com/D10859
Minor, correct spelling of PKCS8 key format

Summary: I faked this out locally because of the OSX stuff and goofed the
key format spelling.

Auditors: btrahan
Don't show "View Wiki" reminder link if viewer has no access to Phriction

Summary: Fixes T6581.

Test Plan:
  - Loaded project page with Phriction accessible, saw link.
  - Loaded project page with Phriction uninstalled, no link.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T6581

Differential Revision: https://secure.phabricator.com/D10868
Differential - make DifferentialDiffEditor into a real transaction editor.

Summary: Ref T6237. This sets us up for some future work like T6152, T6200 and generally cleaning up this workflow a bit. Tried to do as little as possible so not exposing transaction view yet. (Though that timeline is going to be a little funky in the common case of just the lone create transaction.)

Test Plan: made a diff from web ui and it worked. made a herald rule to block certain diffs then tried to make such a diff and saw UI letting me know i was blocked

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6237

Differential Revision: https://secure.phabricator.com/D10869
Differential - refine selecting a repository diff --> revision workflow

Summary: Fixes T6200. Ref T6237. When creating a diff from the web view, allow the user to select the repository at that time. When viewing a diff that has no associated revision and then creating a revision, pass along the repository phid to the create revision controller. Within the create revision controller, default the repository selector to this repository phid. Finally, in the editor, stop aggressively resetting the repository phid for every TYPE_UPDATE; rather, do so if its not a new object -- the diff should reign supreme in that case -- or if there's no repository -- let the diff be the guide.

Test Plan:
- made a diff with an associated repo, made a revision from the diff, saw the associated repo and it stuck on save!
- made a diff with an associated repo, made a revision from the diff but changed the repo and it stuck on save!
- made a diff with an associated repo, made a revision from the diff but changed the repo to nothing and it stuck on save!

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6237, T6200

Differential Revision: https://secure.phabricator.com/D10872
Differential - allow setting viewPolicy from web ui during diff creation process

Summary: Fixes T6152, T6237. This introduces a viewPolicy column to the DifferentialDiff, and re-jiggers the DifferentialDiff policy implementation such that things behave as before once associated with a revision, else use the DifferentialDiff policy column value.

Test Plan: made a diff with a non-standard view policy and noted that policy was still selected in the revision step. arc lint.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6237, T6152

Differential Revision: https://secure.phabricator.com/D10875
Merge branch 'master' of github.com:phacility/phabricator

* 'master' of github.com:phacility/phabricator:
  Differential - allow setting viewPolicy from web ui during diff creation process
  Differential - refine selecting a repository diff --> revision workflow
  Differential - make DifferentialDiffEditor into a real transaction editor.
  Don't show "View Wiki" reminder link if viewer has no access to Phriction
  Minor, correct spelling of PKCS8 key format
  Process Remarkup in text and HTML email bodies appropriately
  Search Typeahead - make exact matches show up first
  Differential - stop showing the shield for "move away" operations
  Clean up Multirow Manager UI
  Don't add "To/Cc" to HTML mail bodies if there's no HTML mail body
  Allow Phabricator to accept Conduit requests signed with an SSH key