Adds a --7ziplevel param to dumpBackup.php and dumpTextPass.php,
used when an --output of type '7zip' is specified.
Bug: T78669
Change-Id: I9ee8169daf30b4d8251c7a344b593c29c81eb799
Moved classes in Export.php to seperate files in the new directory
includes/export/ and updated autoload.php to these new locations.
Bug: T122531
Change-Id: Idd3bba5a85d65c952f2ff503bea2ca76624c9b7f