🐛 Fix classmap retrieval for root package

⚰️ 🐛 Drop dead code and fix PHP8 namespace token changes

PHP8 now has T_NAME_QUALIFIED and T_NAME_FULLY_QUALIFIED for namespace token (https://www.php.net/manual/en/tokens.php).

🐛 Revert and remove invalid ltrim of `\` in classname

⚰️ 🐛 Drop dead code and fix PHP8 reflection changes

✨ Road to PHP 8, correctly push `composer-mouf.lock`

✨ Road to PHP 8, upgrade mouf/mouf-installer and nikic/php-parser

✨ Road to PHP 8, upgrade `composer-mouf.json`

✨ Road to PHP 8, remove inexistant `get_magic_quotes_gpc` call

✨ Road to PHP 8

✨ Road to PHP 8