File names should be editable.

Summary: Fixes T7480, File names should be editable and the event should show up in feed.

Test Plan: Upload a file, view file details, edit file, change file name by adding a space and a word to the name, save changes, file name should retain space and not normalize the name, file details should show the edit event, install feed should correctly show an event for the action.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7480

Differential Revision: https://secure.phabricator.com/D12561