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Update everything to work with PHP 8.3
A lot of stuff has been deprecated or made stricter with return type annotations. Also, the SimplePie ad-hoc autoloader stopped working, so I switched it to use Composer to manage the external dependencies (SimplePie and urljoin). This also means that anyone installing or upgrading will need to run
composer install
(this has been documented in the README).I have verified that this still works with PHP 8.1, although I cannot guarantee it on older versions.