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

(cherry picked from commit ab113b744fab9484b16683928ccf61d0aac9b7af)
Fix EZP-22128: Update Copyright info in extension.xml

(cherry picked from commit 5957a13e72931332b346462a8aaf3da9f407dcef)
Fix EZP-22128: Remove ezinfo.php, extension.xml replaced it some years ago

(cherry picked from commit 9181ead00e714ced7000203ce570fc8d3c2eea3c)