When an edit overrides an object lock, note it in the transaction record

Summary:
Ref T13244. See PHI1059. When you lock a task, users who can edit the task can currently override the lock by using "Edit Task" if they confirm that they want to do this.

Mark these edits with an emblem, similar to the "MFA" and "Silent" emblems, so it's clear that they may have bent the rules.

Also, make the "MFA" and "Silent" emblems more easily visible.

Test Plan:
Edited a locked task, overrode the lock, got marked for it.

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: aeiser

Maniphest Tasks: T13244

Differential Revision: https://secure.phabricator.com/D20131