Move new feature inventory into module stock.

htdocs/core/class/coreobject.class.php

htdocs/core/class/listview.class.php

htdocs/core/js/listview.js

htdocs/core/menus/standard/eldy.lib.php

htdocs/langs/en_US/stocks.lang

htdocs/modulebuilder/skeletons/skeleton_card.php

htdocs/product/inventory/ajax/ajax.inventory.php

htdocs/product/inventory/card.php

htdocs/product/inventory/class/inventory.class.php

htdocs/product/inventory/list.php

htdocs/product/inventory/tpl/inventory.tpl.php