WooCommerce Lightspeed POS Integration 2.16.6

* Fix - Fixes a bug where variable/matrix attribute were not being set correctly
* New - Adds much better test coverage around matrix imports

* New - Introduces selective sync for updates on Lightspeed products
* Tweak - Better test coverage

* Introduces selective sync for updates on WooCommerce products
* Fixes a bug that removed long and short descriptions
* Fixes a bug where single-store Lightspeed setups could not initialize the plugin
* Fixes pricing bug where matrix items were not showing pricing on the import table
* Auto-loading for imported variable products will now automatically publish new variation products
* Various other enhancements