How to configure NetBeans 11 for CodeIgniter 3.1.10 ?

The NetBeans plugin was started back with NetBeans 8, but never completed.
The repository was left up in case the code might be of use to anyone, but with no guarantees.

I use NetBeans 10 with CI3 & 4 just fine. Out of the box, it has code completion, support for PHP7, etc.