Multiple bug fixes / extended plugin support

【Contents of fixes】
■Support for extended plug-ins
　・WCEX Auto Delivery
　・WCEX Multiple Shipping
　・WCEX Coupon
■Adjusted the display position of the third level of the global menu submenu.
■Fixed a bug that the thumbnails of archive pages are also hidden when “Show Thumbnails” is unchecked in “Post Detail Page Settings” of “Theme Options > Notification > Display Settings
■Fixed the bug that the title of the product category page may not be displayed correctly when using the plugin “Welcart e-Commerce (Version: Version 1.9.14)”.

The files that have been modified for this update are as follows
【Corrected files】
archive-news.php
functions/welcart.php
languages/ja.mo
languages/ja.po
style.css
template-parts/page-header.php
wc_templates/cart/wc_customer_page.php
wc_templates/member/wc_member_page.php
wc_templates/member/wc_new_member_page.php
wc_templates/wc_item_single.php
wc_templates/wc_item_single_data.php
wc_templates/wc_item_single_service.php
wc_templates/wc_sku_select.php
wc_templates/wc_sku_select_data.php
wc_templates/wc_sku_select_service.php

【Added files】
auto_delivery.css
wc_templates/member/wc_autodelivery_history_page.php
wc_templates/member/wc_member_msa_page.php
wcex_multi_shipping.css

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