Paraunit 2.2.2: PHPUnit 10.4 support

This is a small patch to smooth the compatibility with the new release of PHPUnit, 10.4. Previous versions would still work fine, but I took the time to fix all the tests (that were broken due to reliance on @internal code such as PHPUnit events) and to add support for the new CLI options regarding the errors baseline.

Terminable Loop Command 1.2.1

This small new patch was needed because we discovered that PHP official Docker images override the STOPSIGNAL directive, using SIGQUIT instead of SIGTERM when shutting down a container. Thanks to Gabriele Colombera for providing the PR.