Fixed multiple bugs / Added new features

【Contents of the fix】
■Fixed the bug that the font size of the fixed page subtitle set in the theme options is not reflected.
■Fixed the bug that custom markers are not displayed in GoogleMaps on the top page.
■Added a new theme option “Custom Script”.
■Fixed the site search function so that contents created with Page Builder are also searchable.
■Fixed a bug that the preview does not work properly on pages using Page Builder.
■Support for WP5.1.1

The following are the files that have been modified for this update.
【Fixed files】
admin/inc/basic.php
functions/head.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/css/googlemap.css
pagebuilder/modules/includes/slick.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
front-page.php
functions.php
style.css

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