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 remote-tracking branch 'upstream/master' into release