Asset Package functions missing  (#12425)

lib/WebGUI/Asset.pm asset edit screen got a "Download Asset as wgpkg Package" link that needs i18n XXX
WebGUI/AssetPackage.pm www_importPackage() now bounces to www_edit() since www_manageAssets() apparently no longer exists; if isAdminOn is true in a PageLayout, this shows the imported asset with toolbars
WebGUI/Operation.pm gets the listPackages op added to its table
WebGUI/Operation/Package.pm added with logic mostly adapted from 7's  WebGUI/Content/AssetManager.pm www_manage()
share/upgrades/7.10.24-8.0.0/addPackagesOperation.pl adds Packages to Admin Console in the config file with an op=listPackages link