WooCommerce Chained Products 3.5.0

* Fix: Chained Product search not returning all search results (products) in some cases
* Fix: Welcome page CSS
* Update: Tested upto WordPress 5.2.1 and WooCommerce 3.6.4
* Update: POT file

* New: WooCommerce 3.6.2 compatible
* Fix: WooCommerce custom product types did not get chained as chained products in some cases
* Fix: Chained products fields not showing in admin when adding a new product in some cases
* Fix: Welcome page CSS added on all admin pages
* Update: Plugin action links
* Update: Welcome page
* Update: Admin notices
* Update: POT file

* New: Allow chained products to be set for all WooCommerce product types (WooCommerce Chained Products - WooCommerce Documentation)
* Fix: Shortcode vanishing from the editor on publish/update of product
* Fix: Sometimes quantity not updated correctly in existing orders
* Update: Always show insert shortcode notice on product add/edit page
* Update: Tested with WordPress 5.1 and latest WooCommerce
* Update: Welcome page
* Update: POT file