Allow for other data in confirmation email subject

[amjohnson46]

Improvement request: It would be nice to have the confirmation email subject be a little more customizable. I have Outlook to group emails by subject, as this is the best way to do most all my other work. If the confirmation emails from this plugin all have the same subject, they get grouped together and that makes it easy to overlook one and hard to find one when searching. Allow for adding the requester's name to the email subject prevents these requests from getting automatically grouped together by an email program. I have a patch already worked out and will submit it.