Improve type and icon information in typeahead

Summary:
Ref T10289. This probably doesn't cover everything but should do a little bit better.

Although we should mabye just exlude milestones from this menu completely?

Test Plan: {F1093937}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10289

Differential Revision: https://secure.phabricator.com/D15191