PHP7 support and others

【Corrections】
■Support for PHP7
■Fixed an error that sometimes appears in the theme options screen.

The following files have been modified for this update.
【Fixed files】
admin/theme-options.php
widget/ad1.php
widget/ad2.php
widget/google_search.php
widget/recommend_post.php
widget/recommend_post2.php
style.css

For more information, please visit the download site for Chill (tcd016) purchasers.