Multiple bug fixes and feature additions

【Contents of fixes】
■upport for PHP7
■Fixed a bug in the footer bar display when viewing on tablets.
■Fixed a bug that the logo image in the header was not displayed when viewing on a tablet.
■Added custom script function.

The following files have been modified for this update.
【Fixed files】
admin/theme-options.php
functions/head.php
functions/logo.php
languages/ja.mo
languages/ja.po
widget/ad.php
widget/archive_dropdown.php
widget/category_list.php
widget/google_search.php
widget/project_list.php
widget/styled_post_list1.php
widget/tab_post_list.php
footer.php
style.css

For more information, please visit the download site for purchasers of MONOLITH (tcd042).