"Auto Download" feature, downloads every interaction to local disk

[ldionmarcil]

Hi all. We have often ran into situations where we lost our interaction data, which led to very awkward situations. This PR implements an auto download feature which when activated, will download every interaction data to disk using js-file-download. This feature allows testers to use interactsh-web and have it log everything to disk. This was my first time writing React, so any modifications welcome.