Summary:
- Remove the "Priority" column, since this is indicated by the color swatch, to save space.
- Reduce the "Updated" column from datetime to date only, since time isn't incredibly useful, to save space.
- Show the first two projects a task is associated with, and "..." if there are more.
- Show "None" (for "no owner") in a lighter color.
Test Plan: Looked at tasks on homepage and in Maniphest.
Reviewers: btrahan, 20after4
Reviewed By: btrahan
CC: aran, edward
Maniphest Tasks: T967
Differential Revision: https://secure.phabricator.com/D2065
