Added color setting function and adjusted display style of fixed pages

【Contents of fix】
■Fixed an issue where the aspect ratio of the “header image” of the fixed page was not maintained when displayed on a smartphone.
■Fixed the bug that the alternative image is not displayed on iPad when the youtube video is set in the header content of the top page.
■Fixed an issue where the design of the global navigation would momentarily collapse after a page transition.
■Fixed structured markup in breadcrumb list.

The following are the files that have been modified for this update.
【Corrected files】
breadcrumb.php
css/responsive.css
front-page.php
functions/head.php
header.php
languages/ja.mo
languages/ja.po
style.css

For more information, please visit the MAXX (tcd043) download site for purchasers.