Upgrade language level to PHP 7.4 #20
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I increased the minimum required version of PHP to 7.4 and added strong type hints everywhere I could. It was not always possible, but I think it turned out pretty good. I updated all composer dependencies and I also added PHPUnit and PHP-CS-Fixer as development dependencies. I also had to fix the unit tests to be compatible with PHPUnit 9.
The tests all run successfully now, but I would appreciate a second opinion on whether they still make sense.