Fixed multiple bugs / WP5.1.1 compatible

【Contents of fixes】
■Fixed a bug that the transparency of the background color could not be set to 0 in the page header settings of fixed pages.
■Adjusted the display of the field for setting small values in TCD theme options, etc.
■Fixed a bug that links to non-image areas when Retina is selected in the logo image settings.
■Changed the widget “Category List (tcd version)” to accordion support.
■Fixed the bug that “meta title” is not reflected.
■Fixed a bug where changes to TCD theme options could not be saved when not using the visual rich editor.
■Adjust wording of TCD theme options
■Fixed an issue where the search function in the site would search for content created with Page Builder.
■Fixed a bug in which the preview did 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
admin/js/my_script.js
admin/js/my_script.min.js
assets/fonts/design_plus.eot
assets/fonts/design_plus.svg
assets/fonts/design_plus.ttf
assets/fonts/design_plus.woff
assets/js/functions.js
assets/js/functions.min.js
inc/class-tcd-meta-box.php
inc/seo.php
inc/widget/category_list.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/googlemap.js
pagebuilder/assets/admin/js/repeater.js
pagebuilder/assets/admin/js/tab.js
pagebuilder/assets/css/googlemap.css
pagebuilder/assets/css/pagebuilder.css
pagebuilder/assets/css/slider.css
pagebuilder/assets/css/tab.css
pagebuilder/modules/catchcopy.php
pagebuilder/modules/editor.php
pagebuilder/modules/googlemap.php
pagebuilder/modules/headline.php
pagebuilder/modules/image.php
pagebuilder/modules/includes/slick.php
pagebuilder/modules/includes/theme_options.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
functions.php
style.css

【Added files】
pagebuilder/assets/admin/js/simple_table.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/assets/css/simple_table.css
pagebuilder/assets/js/googlemap.js
pagebuilder/modules/simple_table.php