PluXml 5.8.6

[+] Update PHPMailer 6.2.0 : security fixes and PHP 8.0 compatibility (P3ter)
[+] Distinct article and comment rss feeds configuration #521 (thx3r)
[+] Refine plxMotor::urlRewrite() to use parse_url() #520 (bazooka07)
FIX Missing thumbnail in first article #518 #525 (bazooka07, sudwebdesign)
FIX Error when editing .htaccess when Apache is not installed (P3ter)
FIX 404 Error when accessing /blog with url rewriting (bazooka07)
FIX Error on article publication caused by regex in plxMotor::artInfoFromFilename() #522 (bazooka07)
FIX Wording change on the capcha question #523 (Thx3r)