Compatible with WP5.1.1 / Minor fixes

【Contents of fix】
■Added support for WordPress 5.1.1 (Gutenberg).
■Changed some of the icon sets in the Page Builder “Feature List” because there were duplicates.

The following files have been modified for this update.
【Corrected files】
admin/theme-options.php
admin/css/my_admin.css
admin/js/my_script.js
fonts/design_plus.eot
fonts/design_plus.svg
fonts/design_plus.ttf
fonts/design_plus.woff
functions/head.php
functions/lp_builder.php
language/ja.mo
language/ja.po
pagebuilder/pagebuilder.php
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/css/media-field.css
pagebuilder/assets/admin/css/repeater.css
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/admin/css/function_list.css
pagebuilder/assets/admin/css/pagebuilder.css
pagebuilder/assets/admin/css/slider.css
pagebuilder/assets/admin/css/tab.css
pagebuilder/assets/admin/js/tab.js
pagebuilder/modules/includes/media-field.php
pagebuilder/modules/includes/repeater.php
pagebuilder/modules/catchcopy.php
pagebuilder/modules/editor.php
pagebuilder/modules/functional_comparison.php
pagebuilder/modules/googlemap.php
pagebuilder/modules/headline.php
pagebuilder/modules/image.php
pagebuilder/modules/price_table.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
functions.php
style.css

【Added files】
pagebuilder/assets/admin/js/simple_table.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/assets/admin/js/tab.js
pagebuilder/assets/admin/css/googlemap.css
pagebuilder/assets/admin/css/simple_table.css
pagebuilder/assets/admin/js/googlemap.js
pagebuilder/modules/includes/hex2rgb.php
pagebuilder/modules/includes/slick.php
pagebuilder/modules/includes/theme-options.php
pagebuilder/modules/simple_table.php

【Deleted files】
pagebuilder/assets/admin/css/admin_bk.css
pagebuilder/assets/admin/js/jscolor.js
all files in pagebuilder/assets/admin/img/ directory
pagebuilder/assets/admin/js/slider.js
pagebuilder/modules/includes/jscolor.php

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