WooCommerce Cost of Goods 2.13.3

* Misc - Add support for WooCommerce 3.5

* Tweak - Apply costs to previous orders and subscriptions via background process
* Fix - Avoid duplicating pricing labels per unit with Measurement Price Calculator when updating variations or changing the pricing unit in the measurement settings
* Fix - When exporting Product Valuation reports via CSV, prepend the SKU to the product name as it appears in the corresponding admin screen table
* Misc - Remove support for PHP 5.2: PHP 5.3 is now the minimum supported version

* Feature - Improve Measurement Price Calculator compatibility by factoring user-defined quantities into the cost of goods
* Fix - Ensure proper decimal formatting in the suggested cost on the admin order screen
* Fix - Properly escape product valuation CSV exports
* Fix - Ensure subscription costs are applied to renewal orders