This reports whether the device has touch input as a primary input mechanism in
rageshakes and analytics.
For analytics, this replaces the identity server (which ends up being reported
as "<redacted>" by default anyway) because Matomo only supports a limited number
of custom variables.
For https://github.com/vector-im/riot-web/issues/3304
This generates something similar to what the rageshake server does, just in an easy package for people to use. tar-js was chosen over zip or anything else because it's small, simple, and stable.
Note: this doesn't work in Chrome, but firefox seems to be okay with it. Chrome appears to be blocking the download for some reason - the very first download was fine, but none afterwards
We use `export default` begrudgingly here. Ideally we'd use just `export`, though this entire SDK expects things to be exported as a default. Instead of breaking everything, we'll sacrifice our export pattern for a smaller diff - a later commit can always do the default export -> regular export conversion.
