Support for multiple bugs/additional functions

【Contents of fixes】
■Updated page builder (compatible with WordPress 5.5)
■Fixed the logo and heading tags.
(The h1 tag will be applied to the logo on the top page and archive page, the article title on the detail page, and the header setting > catchphrase on the fixed page.)
■Fixed a bug that there is no space above the text on the second and subsequent pages when splitting pages.
■Fixed a bug in the thumbnail image output of product category pages.
■Fixed the bug that the background image for mobile phones set in the “Header Settings” of the fixed page edit screen is not reflected.
■Fixed a bug in the output of the quick tag “Google map” and supported multiple installation.
■Added “Custom CSS”, “Custom Script”, and “SEO Settings (meta tags)” functions to the individual page edit screen (posts, custom posts, and fixed pages).

The following are the files that have been modified for this update.
【Modified file】
css/responsive.css
functions.php
functions/custom_css.php
functions/logo.php
functions/seo.php
functions/short_code.php
functions/update_notifier.php
js/slick.min.js
page-design1.php
page-ranking.php
page.php
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/pagebuilder.php
single-product.php
style.css
taxonomy-product_category.php