Feature for Export: Csv/Xls, Print, and Email headers

[seanmcne]

The ability to quickly export the headers or print them right from the addin would be very helpful when analyzing multiple messages.

[seanmcne]

Not sure if print is available from within an addin or not, but if you could download the headers as a text file or something printable that would be a great timesaver.

[stephenegriffin]

https://stackoverflow.com/questions/400212/how-do-i-copy-to-the-clipboard-in-javascript

[stephenegriffin]

https://github.com/w3c/clipboard-apis/blob/master/explainer.adoc