Multiple bug fixes

【Contents of the fix】
■Fixed a bug where the change of the title color of the widget “RSS” was not reflected.
■Fixed an error that occurred in PHP7 environment.
■Fixed a bug where the layout of the widget “Thumbnail Article List” was broken on smartphones.

The following files have been modified for this update.
【Fixed files】
co-authors-plus/template-tags.php
functions/widget_color.php
widget/ad.php
widget/category_list.php
widget/category_post.php
widget/google_search.php
widget/ranking_list.php
widget/styled_post_list1.php
widget/styled_post_list2.php
widget/styled_post_list3.php
widget/styled_post_list4.php
style.css

For more details, please visit the download site for purchasers of CORE (tcd027).

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