Multiple bug fixes

【Contents of fixes】
■Support WP5.6 (jQuery version upgrade)
■Fixed output bug of quick tag “Google map” and support multiple installation
■Added annotations for speed-up function.
■Added h1 tag to top page, archive page and fixed page.

The following files have been modified for this update.
【Modified file】
admin/inc/acceleration.php
admin/js/my_script.js
archive-news.php
archive-product.php
functions.php
functions/head.php
functions/logo.php
functions/ogp.php
functions/short_code.php
index.php
languages/ja.mo
languages/ja.po
page-company.php
page-design1.php
page-design2.php
page.php
style.css
taxonomy-news_category.php
taxonomy-product_category.php

【Added files】
js/jquery.easing.1.4.js

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