Renaming ArchiveProcessing in comments as well, adding missing header

core/Archive.php

core/ArchiveProcessor.php

core/DataAccess/Archiver.php

core/DataArray.php

core/DataTable/Manager.php

plugins/API/API.php

plugins/Actions/Actions.php

plugins/CustomVariables/CustomVariables.php

plugins/DevicesDetection/DevicesDetection.php

plugins/Goals/Goals.php

plugins/Provider/Provider.php

plugins/Referers/Referers.php

plugins/Transitions/API.php

plugins/UserCountry/UserCountry.php

plugins/UserSettings/UserSettings.php

plugins/VisitTime/VisitTime.php

plugins/VisitorInterest/VisitorInterest.php

tests/PHPUnit/Core/ArchiveProcessingTest.php