Disallow <! in <script>

Summary:
HTML5 has this crazy script escaping states:

- Script data escaped dash dash state
- Script data double escaped state

https://communities.coverity.com/blogs/security/2012/11/16/did-i-do-that-html-5-js-escapers-3

Perhaps `<!` is too aggressive but I didn't spend much time searching for a more fine grained expression.

Test Plan: Searched for `renderInlineScript()`.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7329
Modernize policies in Paste and Macro

Summary:
Ref T603. Fixes T2823. This updates Paste and Macro.

  - **Paste**
    - Added default view policy.
    - I didn't add a "create" policy, since I can't come up with any realistic scenario where you'd give users access to pastes but not let them create them.
  - **Macro**
    - Added a "manage" policy, which covers creating and editing macros. This lets an install only allow "People With An Approved Sense of Humor" or whatever to create macros.
    - Removed the "edit" policy, since giving individual users access to specific macros doesn't make much sense to me.
    - Changed the view policy to the "most public" policy the install allows.
    - Added view policy information to the header.

Also fix a couple of minor things in Maniphest.

Test Plan:
  - Set Paste policy, created pastes via web and Conduit, saw they got the right default policies.
  - Set Macro policy, tried to create/edit macros with valid and unauthorized users.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2823, T603

Differential Revision: https://secure.phabricator.com/D7317
Provide application and object level policy controls in Slowvote

Summary: Ref T603. Gives the create/edit interface a policy control, and adds an application-level default.

Test Plan: Created and edited polls.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7321
Add application and object level policy controls to Countdown

Summary: Ref T603. Give countdowns proper UI-level policy controls, and an application-level default policy. Put policy information in the header.

Test Plan:
  - Adjusted default policy.
  - Created new countdowns.
  - Edited countdowns.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7322
Fix an issue with rendering PHID lists containing `null` in Maniphest

Summary: See IRC. Someone got a `null` in CCPHIDs somehow. Moving to subscriptions should prevent this, but paper over it for now.

Test Plan: Will have @dctrwatson check.

Reviewers: btrahan, dctrwatson

Reviewed By: btrahan

CC: dctrwatson, aran

Differential Revision: https://secure.phabricator.com/D7330
Misc Diffusion/Differential CSS tweaks

Summary: Various tweaks and fixes. Adds a File Contents view in Diffusion, normalizes spaces, colors.

Test Plan: tested differential and diffusion in my sandbox.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T3952

Differential Revision: https://secure.phabricator.com/D7325
Delete unintentional phlog()

Leaked in D7329.
Phtize phabricator-remarkup-assist

Test Plan: Translated 'bold text' as 'txt', clicked on B without selection, saw 'txt'.

CC: epriestley, aran

Differential Revision: https://secure.phabricator.com/D7335
Implement Graphviz, Figlet and Cowsay as Remarkup interpreter blocks

Summary: Fixes T3274. Fixes T3964. Ref T3591.

Test Plan: {F70928}

Reviewers: btrahan

Reviewed By: btrahan

CC: chad, aran

Maniphest Tasks: T3274, T3964, T3591

Differential Revision: https://secure.phabricator.com/D7332
White policy icons

Summary: White policy icons for hover states, rebuilt 2x icons

Test Plan: photoshop

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7337
Add an icon+background selector for project images

Summary: Makes it easy to choose distinctive icons for projects.

Test Plan:
{F71018}

{F71020}

{F71019}

{F71021}

Reviewers: btrahan, chad

Reviewed By: chad

CC: chad, aran

Differential Revision: https://secure.phabricator.com/D7333
Add some missing non-context translations

Summary: We're missing some strings here.

Test Plan: {F71857}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7340
Distinguish between invalid/broken handles and filtered handles

Summary:
Ref T603. Currently, we render handles the user doesn't have permission to see in a manner identical to handles that don't exist. This is confusing, and not required by policies (which restrict content, but permit knowledge that an object exists).

Instead, render them in different styles. Bad/invalid objects look like:

  Unknown Object (Task)

Restricted objects look like:

  [o] Restricted Task

...where `[o]` is the padlock icon.

Test Plan:
{F71100}

{F71101}

It's possible this renders weird somewhere, but I wasn't immediately able to find any issues. Yell if you see something.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: chad, aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7334
Fix lightbox downloads for embeded images and a warning

Summary:
I refactored this recently and accidentally dropped the download URI.

Also fix a warning with, e.g., files named `README`.

Test Plan: Clicked a thumb, clicked "Download", got a file.

Reviewers: chad, btrahan, dctrwatson

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D7341
Require application "Can Use" capability to call Conduit methods

Summary: Ref T603. If you don't have access to an application, prevent execution of its (authenticated) methods.

Test Plan: Restricted Tokens to only admins, then tried to view/call Token methods as a non-admin.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7342
Remove UI warnings about policies being a janky mess

Summary: Ref T603. While policies aren't completely perfect, they are substantially functional to the best of my knowledge -- definitely in good enough shape that we want to hear about issues with them, now.

Test Plan: Edited a task, repository, and project.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7343
Link Remarkup Icon

Summary: Icon for a link

Test Plan: photoshop

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7344
Add Link button to Remarkup assist

Summary: Believe it or not, I forgot how to create a link in Remarkup.

Test Plan: Clicked on it with selected URL, selected text and without a selection.

Reviewers: chad, epriestley

Reviewed By: epriestley

CC: epriestley, aran, chad

Differential Revision: https://secure.phabricator.com/D7336
Merge branch 'master' of http://github.com/facebook/phabricator