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

(cherry picked from commit d5d9d263ee4cdbdb38d4248140b0ac39cccab915)
Fix EZP-22128: Update Copyright info in extension.xml

(cherry picked from commit c9ccaea5c5cfdcf4daab41639740bacfecb35adf)
Fix EZP-22128: Remove ezinfo.php, extension.xml replaced it some years ago

(cherry picked from commit 9d4d7ddfa575987294e15408a3b2a812c7d675e1)