Fix EZP-22128: Change license & copyright info to be in root of project

(cherry picked from commit a015b21b5d10aa2c719b6221b39d30d7f660fae5)
Fix EZP-22128: Update Copyright info in extension.xml

(cherry picked from commit 54b07740bbcf4fffe81fc782d30546edf0071545)
Fix EZP-22128: Remove ezinfo.php, extension.xml replaced it some years ago

(cherry picked from commit 01d47129c90a042ed96fc4dafb2049bb2acfc5c1)