Projects - fix missing subscriber handling code in the editor

Summary: Fixes T6719. At some point, we added automagical subscriptions via @mentions, and these were failing in project descriptions from a lack of an implementation in the editor. Said "implementation" is to do nothing, but it needs to be there nonetheless.

Test Plan: updated a project mentioning someone in the description and it worked. also saw a 'subscriber added' transaction

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6719

Differential Revision: https://secure.phabricator.com/D10951
Remove Remarkup icons from source

Summary: These are not used

Test Plan: grep codebase

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10938
Conpherence - fix add participant / remove participant form

Summary: Ref T6713. We were dropping latest transaction ID. This should fix the "easy" part of T6713.

Test Plan: tried to add participants and it worked! (removing participants only allows yourself, but that worked too.)

Reviewers: chad, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6713

Differential Revision: https://secure.phabricator.com/D10952
Title/Description quering for Passphrase credential

Summary: Fixes T6562, Title/Description querying for Passphrase

Test Plan: Open Passphrase, open advanced queries, enter a title and/or description. Search results should show credentials matching the search.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6562

Differential Revision: https://secure.phabricator.com/D10953
Have home dashboards go to single column on narrow desktops

Summary: Ref T6723. Because of the sidenav, some dashboard layouts may perform poorly on more narrow desktop displays. This provides an additional media query and CSS rules.

Test Plan:
Move viewport to 1001 px, see desktop, move to 999 pixels, see tablet-like display.

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Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6723

Differential Revision: https://secure.phabricator.com/D10956
Add title to ObjectItemList headers for truncated displays

Summary: Ref T6723. This allows you to hover over truncated headers and get the full text if needed.

Test Plan:
Hover over header, see full title

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Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6723

Differential Revision: https://secure.phabricator.com/D10958
Revert "Add title to ObjectItemList headers for truncated displays"

This reverts commit f71a83f52e8ee037860bd81604e607ccb031b4df.
Merge branch 'master' of github.com:facebook/phabricator