Added custom script function/updated page builder

【Contents of modification】
■Add custom script function
(Appearance > TCD Theme Options > Basic Settings)
■Updated page builder (compatible with WordPress 5.5)

The following files have been modified for this update.
【Modified file】
admin/theme-options.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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