Specification changes / multiple bug fixes

【Contents of fix】
■Changed Facebook OGP setting from old specification (fb:admins) to new specification (fb:app_id).
※Please refer to the following article about how to get “fb:app_id” (application ID).
　How to get fb:app_id required for Facebook OGP setting
■WP5.6 support (compatible with jQuery upgrade)
■【Mac】Fixed a bug in which Japanese and European characters were displayed with different thickness when using some fonts.

The following files have been modified for this update.
【Modified file】
admin/theme-options.php
comments.php
editor-style-02.css
functions/head.php
functions/ogp.php
functions/seo.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/css/pagebuilder.css
style.css
widget/ad.php
widget/archive_dropdown.php
widget/category_list.php
widget/google_search.php
widget/styled_post_list1.php
widget/tab_post_list.php
widget/work_list.php

【Added files】
js/jquery.easing.1.4.js

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