Removed unused imports in core/ and plugins/

core/API/DataTableGenericFilter.php

core/API/DataTableManipulator.php

core/API/DataTableManipulator/Flattener.php

core/API/DataTableManipulator/LabelFilter.php

core/API/DataTableManipulator/ReportTotalsCalculator.php

core/API/ResponseBuilder.php

core/Access.php

core/Archive.php

core/Archive/Parameters.php

core/ArchiveProcessor.php

core/ArchiveProcessor/PluginsArchiver.php

core/ArchiveProcessor/Rules.php

core/AssetManager.php

core/AssetManager/UIAssetMerger.php

core/AssetManager/UIAssetMerger/JScriptUIAssetMerger.php

core/AssetManager/UIAssetMerger/StylesheetUIAssetMerger.php

core/AssetManager/UIAssetMinifier.php

core/CliMulti/RequestCommand.php

core/Common.php

core/Console.php