YITH WooCommerce Affiliates Premium 3.15.0

* New: support for WordPress 5.5
* New: support for WooCommerce 4.4
* New: option to allow affiliates withdraw an amount of their choice
* New: breadcrumb for Affiliate Dashboard now contains link to get back to Dashboard home
* Update: plugin framework
* Tweak: reviewed withdraw shortcode appearance
* Tweak: added affiliate handling to REST api that creates order
* Tweak: affiliate now logs out directly from affiliate dashboard
* Fix: improved affiliate profile update, to avoid affiliate not having correct role
* Fix: prevent possible fatal when showing referrer form
* Fix: avoid auto commission also when there is a affiliate coupon applied in the order
* Dev: added yith_wcaf_max_rate_value filter
* Dev: added yith_wcaf_line_item_commission_total filter
* Dev: added yith_wcaf_line_total_check_amount_total filter
* Dev: added yith_wcaf_no_affiliate_message filter
* Dev: added yith_wcaf_user_details_affiliates_table filter

* New: support for WooCommerce 4.2
* Tweak: fixed wrong text domain for some strings
* Tweak: improved appearance of affiliate details panel
* Fix: losing status selection after filtering on admin views
* Dev: added yith_wcaf_comission_table_columns filter
* Dev: added yith_wcaf_create_item_commission filter
* Dev: added yith_wcaf_enqueue_fontello_stylesheet filter
* Dev: added yith_wcaf_ipn_listener_apply_custom_cainfo filter for IPN validation curl call
* Dev: added yith_wcaf_ipn_listener_custom_cainfo filter for IPN validation curl call
* Dev: added yith_wcaf_ipn_listener_apply_custom_httpheader filter for IPN validation curl call
* Dev: added yith_wcaf_ipn_listener_custom_httpheader filter for IPN validation curl call
* Dev: add second parameter on yith_wcaf_use_percentage_rates hook

* New: support for WooCommerce 4.1
* Update: plugin framework
* Tweak: removed max attribute from payment threshold field
* Tweak: hotfix paypal return url, to set back affiliate cookie when getting back to site after cancelling order
* Fix: removed translation on screen id, that was causing missing assets on admin on non-english sites
* Dev: added yith_wcaf_withdraw_amount_allow_exceeding_max filter