Added functions / fixed multiple bugs

【Contents of fixes】
■Updated page builder (for WordPress 5.5)
■Added the function to display the detailed page URL of the style search result in a new window.
■Fixed a bug that the link does not work when there is only one article to display in the news ticker.
■Fixed a bug where YouTube videos set as header content would not play 【MacOS/Big Sur】
■Fixed a minor bug.

The following are the files that have been fixed in this update.
【Fixed files】
admin/inc/style.php
archive-style.php
assets/css/jquery.mb.YTPlayer.min.css
assets/js/jquery.mb.YTPlayer.min.js
inc/footer.php
inc/style-search.php
inc/update_notifier.php
inc/widgets/banner_list.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/editor.js
pagebuilder/assets/admin/js/repeater.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/modules/googlemap.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css

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