Feature/modernize

[Chris53897]

Hi. I am working on an a version for php 7.4 and 8 for symfony >= 5 It works in my demo application. But it is my first use of this bundle. I am not sure if everythink is correctly working.

I can not get the ConsoleControllerTest to work. If someone has a solution, please let me know. https://github.com/Chris53897/ConsoleBundle/runs/3704048745?check_suite_focus=true

`

1. CoreSphere\ConsoleBundle\Tests\Controller\ConsoleControllerTest::testConsoleActionWorkingDir TypeError: Double\Twig\Environment\P1::render(): Return value must be of type string, null returned

/home/runner/work/ConsoleBundle/ConsoleBundle/Controller/ConsoleController.php:50 /home/runner/work/ConsoleBundle/ConsoleBundle/Tests/Controller/ConsoleControllerTest.php:34`