Page builder feature added and multiple bug fixes

【Details of feature additions and fixes】
■Added page builder function.
■Fixed a bug that the behavior of the button to return to the top of the page becomes unstable when the setting of Basic Settings > Load Screen is off in smartphone display.
■Added the ability to change the breadcrumb text and slug of the custom post type “Announcement” as desired.
■Added “Button with Arrow for ORION” to the quick tags included in the theme.
■Fixed a bug that the text color of the button reflects the color of the link text in Preferences > Link text when using “Button with Arrow for ORION” on special pages.
■Fixed structured markup in breadcrumb list.
■Fixed an error in PHP 7.1 environment.

The following files have been modified for this update.
【Modified file】
・admin/js/mce-button.js
・admin/theme-options.php
・breadcrumb.php
・functions.php
・functions/custom_editor.php
・functions/repeater.php
・js/jscript.js
・languages/ja.mo
・languages/ja.po
・style.css
【Added files】
・pagebuilder folder
・pagebuilder/assets
・pagebuilder/assets/admin
・pagebuilder/assets/admin/css
・pagebuilder/assets/admin/css/admin.css
・pagebuilder/assets/admin/css/media-field.css
・pagebuilder/assets/admin/css/repeater.css
・pagebuilder/assets/admin/js
・pagebuilder/assets/admin/js/admin.js
・pagebuilder/assets/admin/js/editor.js
・pagebuilder/assets/admin/js/googlemap.js
・pagebuilder/assets/admin/js/media-field.js
・pagebuilder/assets/admin/js/repeater.js
・pagebuilder/assets/css
・pagebuilder/assets/css/pagebuilder.css
・pagebuilder/assets/css/slider.css
・pagebuilder/assets/css/tab.css
・pagebuilder/assets/img
・pagebuilder/assets/img/slider_arrow1.png
・pagebuilder/assets/img/slider_arrow2.png
・pagebuilder/assets/js
・pagebuilder/assets/js/tab.js
・pagebuilder/modules
・pagebuilder/modules/catchcopy.php
・pagebuilder/modules/editor.php
・pagebuilder/modules/googlemap.php
・pagebuilder/modules/headline.php
・pagebuilder/modules/image.php
・pagebuilder/modules/includes
・pagebuilder/modules/includes/media_field.php
・pagebuilder/modules/includes/repeater.php
・pagebuilder/modules/slider.php
・pagebuilder/modules/tab.php
・pagebuilder/pagebuilder.php