Core and most of plugins have been fitted with class autoloaders. These autoloaders (where present) are located in plugins/%plugin name%/include/autoload.php
These files are auto-generated so please do not edit!
When you add a new class, you need to regenerate the corresponding autoload.php file. To do so, run the following command from the Tuleap sources:
$ make autoload-docker
There is a tool that will remove all instances of require_once from all files in a given directory.
$ tools/utils/autoload/generate.sh plugin/%plugin name%/include/
Tip: run a git diff to carefully check all changes made by the tool!