Summary:
Fixes T5373. Ref T5281. Several changes:
- The `marshallExceptions` thing is useful if JS throws an exception when invoked from Flash, so set it. The resulting exceptions are a little odd (not escaped correctly, e.g.) but way better than nothing.
- Put connection status in the notification menu.
- When the connection fails, try to provide contextual help where we can.
Test Plan: {F169493}
Reviewers: chad, joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T5281, T5373
Differential Revision: https://secure.phabricator.com/D9700
