Ultimate Member - WooCommerce 2.4.4

* Fixed: PHP error when Shop page isn't set
* Fixed: Product restriction inside Woocommerce Blocks. Force restriction by default
* Tweak: Unified `UM()->fields()->editing` and `UM()->fields()->viewing` to bool variables use true|false in conditions to make `===` or `!==` comparing

* Added: Hook `um_woocommerce_account_orders_per_page` for pagination in the Account > Orders list
* Fixed: Conflict with the WooCommerce Memberships plugin that breaks dropdown fields on Account page

* Added: WooCommerce custom callbacks to allowed callback options on install
* Added: Ultimate Member register page URL on the checkout page with required registration an logged in user
* Fixed: Hide restriction products when using WooCommerce [products] shortcode
* Fixed: Account > Subscription auto renew toggle, changed template