WooCommerce Google Analytics Pro 2.2.0

* Misc - Add support for WooCommerce 3.4
* Tweak - Introduce filter to remove the Google Analytics tracking code

* Feature - Add integration with WooCommerce Subscriptions
* Feature - Add support for Google Optimize

* Tweak - Improve detection of Google Analytics by MonsterInsights
* Tweak - Improve UUID generation technique
* Tweak - Report transactions held by Paypal after payment capture
* Tweak - Set non-interaction flag for subscription order renewal events
* Fix - Correctly set non-interaction flag on measurement protocol events
* Fix - Prevent duplicate payment method events from firing during checkout
* Fix - Strip HTML tags from payment gateway titles