Fixed bugs/added functions/updated page builder

【Contents of fixes】
■Add custom script function
(Appearance > TCD Theme Options > Basic Settings)
■Updated page builder (compatible with WordPress 5.5)
■Fixed a bug that Pegman was not displayed in the map displayed by the TCD Google Maps plugin.

The following are the files that have been modified for this update.
【Modified file】
admin/theme-options.php
functions/custom_page_link.php
functions/head.php
functions/update_notifier.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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