Fixed some typos and code styling, dropped support for PHP 7.4 and use new PHP 8 only features #46
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This PR drops support for PHP 7.4 and leverages some of PHP 8s features. Apart from requiring PHP 8, the API is still the same, meaning apps already running on PHP 8 won't be broken.
Along with that, I fixed some typos and some code style inconsistencies and added/updated DocBlocks.