Add device detection/ID provided by modules: fingerprintjs2

This is a feature request to support identification by device rather than just user agent in order to have greater confidence in individuality and distinction.

The JS library https://github.com/Valve/fingerprintjs2 looks promising.

It could work like so (assuming enabled and fingerprintjs2 lib is installed:

1. On user login form submit
2. fingerprintjs2 is invoked to get device fingerprint and stores in hidden form field
3. Login History form alter reads submitted device fingerprint and uses instead of user agent

Other JS libs can be considered as well https://www.quora.com/Is-there-any-open-source-project-for-device-finger...