Fixed multiple bugs / WP5.0 compatible

【Contents of fixes】
■Added support for WordPress 5.0 (Gutenberg).
■Fixed a bug that the link to the archive page is not connected when the slug of custom post type is changed.
■Fixed the bug that custom fields in the WORKS edit screen are not displayed when the slug of WORKS is changed.

The following are the files that have been fixed in this update.
【Fixed files】
functions/works.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/googlemap.js
pagebuilder/assets/css/pagebuilder.css
pagebuilder/assets/css/slider.css
pagebuilder/modules/googlemap.php
pagebuilder/modules/image.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
front-page.php
style.css