Add a hook for displaying extra comment information for reviews.

Review Request #4736 — Created Oct. 13, 2013 and submitted — Latest diff uploaded

Information

Review Board
master

Reviewers

Add a hook for displaying extra comment information for reviews.

This introduces a new hook, CommentDetailDisplayHook, which can be used
to display additional data in reviews and in e-mails (both HTML and
plain text). An extension can use this to show information such as, say,
the severity of a comment.

This does not provide the ability to display in the review dialog, as
that's generated in JavaScript entirely. That will be added in a future
change.

Tested with and without rendered content in the reviews, HTML e-mails,
and plain-text e-mails. Everything looked as I expected it to look.