Renamed lib/session/Datawrapper.php to lib/session/DatawrapperSession.php
Changed datawrapper sessions into lib/bootstrap (now it's called DatawrapperSession.php instead of Datawrapper.php
Created datawrapper hook system files
Added datawrapper hook files to lib/bootstrap.php & changed lib/session/Datawrapper.php require to DatawrapperSession.php
Added changes to changelog (creation of hook system)