Fixed multiple bugs

【Contents of the fix】
■Fixed an error that may occur in PHP7 environment.
■SSL support for Google custom search widget.
■Fixed a bug that when using only slider 1 in the header content image slider, the link does not work even if the image is tapped on a smartphone.
■Fixed a bug that the layout of the top page may be broken when displayed on a tablet.
■Added a template for displaying attached files.

The following are the files that have been modified for this update.
【Corrected files】
widget/ad.php
widget/archive_dropdown.php
widget/category_list.php
widget/google_search.php
widget/styled_post_list1.php
widget/tab_post_list.php
widget/work_category.php
widget/work_list.php
front-page.php
header.php
index.php
style.css

【Added files】
attachment.php

For more information, please visit the SOURCE (tcd045) download site for purchasers.