more php8 compatibility

improved logout url search for localization (non-english)

previously it would bug out and not find the logout url on non-english accounts, like Norwegian. now it should work in any language.

fix facebook relay

now facebook is randomly asking people "wanna install the facebook app?", not all accounts get it, but some do, and fb won't let you continue until you say yes or no, so say no. after doing that, the facebook relay works again! :)

facebook removed the "name" field

didn't use it, but asserted for it. remove the assert.

Update README.md

do not track msgme_standalone.php