WooCommerce Cost of Goods 2.13.1

* Feature - Add the ability to export the "Product Valuation" report to put all of the product totals in a CSV
* Tweak - Change the way the Total Valuation report is processed to avoid timeouts
* Fix - Ensure Product Valuation lists only count products that have costs and stock to avoid "blank" or incomplete lists
* Fix - Ensure product search on Profit by Product report screen is compatible with WooCommerce 3.0+

* Tweak - Add line item costs to v2 REST API as top-level API data
* Fix - Line item cost fields interfered with the v1 REST API

* Feature - Added support for WooCommerce Customer / Order CSV Export and WooCommerce Customer / Order XML Export Suite custom format builders
* Tweak - Cost fields will now be available via the REST API
* Tweak - Suggest cost while editing or adding line item to an order
* Fix - Ensure Order XML Exports include line item costs in WooCommerce 3.0+
* Misc - Update SkyVerge plugin framework
* Localization - Added Italian translation