Improve rendering of Conpherence fulltext search results
Summary:
Ref T3165. This:
- Fixes a bug with overlapping matches.
- Makes the UI a little less hideous (and more standard).
- Links comments into the chat history view.
Test Plan: {F396749}
Reviewers: chad, btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T3165
Differential Revision: https://secure.phabricator.com/D12777