Popups for success and failure

Adds trigger actions for displaying popups on success and failure, and corresponding messages specific to the situation. How does it look? @kadst43 @BrettASwift 
Go ahead and check it in with these as placeholders - and then fire a note to Juan asking him to look and see if he wants to change them.  String changes are easy to do later.

In theory, he should be able to edit the scenario file to change things like that - or, eventually, do it in the content creation tool.  If we reach the point where he doesn't seem overwhelmed, we might see about having him try doing that...