Fixed multiple bugs and added functionality

【Contents of the fix】
■Fixed a bug that the slider and the title at the bottom of the slider do not work together when “Random” is selected for “Display order of articles” on the top page of the TCD theme options.
■Fixed the site search function so that contents created with Page Builder are also searchable.
■Fixed a bug in Page Builder that the preview may not work properly on pages using Page Builder.
■Fixed a bug in the slider of Page Builder.
■Added custom script function.
■Added table feature to the visual editor.

The following files have been modified for this update.
【Fixed files】
admin/inc/basic.php
assets/js/slick.min.js
inc/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/assets/css/slider.css
pagebuilder/modules/includes/slick.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
template-parts/header-slider.php
functions.php
style.css

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