Add icon, color and profile image to project.query

Summary:

• The icon CSS tag is transformed through the new function PhabricatorProjectIcon::getAPIName($key), which returns a name without fa-.
• Color is a trivial lookup
• Profile image returns the PHID or null if not available

Test Plan:

• Create two projects, with different icon and color, one with and one without profile image.
• Request information on both using project.query

Then:

• Confirm icon and colors are correct for both projects
• Confirm image PHID is correct
• Confirm image PHID is null for the project without image

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: yuvipanda, Korvin, legoktm, epriestley

Maniphest Tasks: T6501

Differential Revision: https://secure.phabricator.com/D10823