WooCommerce Recommendation Engine 3.4.2

* Fix: Check for WC()->session before attempting to use it in the shortcodes.
* Update: When using the shortcode on a page of the site other than a product page, and when the user has never interacted with the site before, grab the top
product for the activity status requested in the shortcode. This product ID will be used for the comparision.
* Update: Fix deprecated call to woocommerce_reset_loop.
* New: Added shortcodes for the three different recommendation types. Must be used on a single product page.
* woocommerce_recommender_viewed_products
* woocommerce_recommender_purchased_products
* woocommerce_recommender_purchased_together

* New: Added a shortcode which can be used anywhere on the site to display Also Viewed and Also Purchased type recommendations. The recommendations are based on the users browsing history.
*Basic Syntax: [woocommerce_related_products_by_status label="Based on your viewing history" type="viewed"]
Type can be either "viewed" or "completed"

* Update: Add additional checking before starting the WC session.
* Update: Fix widget so that it uses a select box instead of a checkbox array for selecting which items to display.