Funnelback 16 support

Adding #3441681 as related; I'd like to get this implemented so we can test our changes.

We've finally got this implementation into PRODUCTION, so I might look at finishing off the tests so it's ready for review.

That took a little while, but I finally got a merge request going with a PHPUnit test for the FB16 data. This code is already running in our PROD environment but if anyone wants to review by all means go for it. I might line up a new beta release featuring this update -- the good news is that it should be backwards-compatible.

Targetting to 2.0.0-beta4.

Automatically closed - issue fixed for 2 weeks with no activity.