Optimization of the smartphone version and multiple bug fixes

【Contents of fixes】
■Updated the fixed footer bar for smartphones.
■Fixes to resolve widget errors in PHP7 environment.
■Changed the search destination URL of the widget “Google Custom Search” to https.
■Fixed the bug that the bottom part of the submenu cannot be clicked only on the top page when there are many submenu items in the global menu.

The following files have been modified for this update.
【Corrected files】
admin/theme-options.php
footer-bar/footer-bar.css
footer-bar/footer-bar.js
footer-bar/footer-bar.php
functions/seo.php
functions/head.php
language/en.po
language/en.mo
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
footer.php
functions.php
style.css
【Added files】
footer-bar/footer-bar2.js
img/common/twitter.png
img/common/facebook.png
img/common/line.png

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