Added favicon setting function and multiple adjustments and bug fixes

【Contents of fixes】
■Favicon (site icon) setting function added to theme options.
■Fixed a bug where the settings in the top page scrolling content settings field were not always reflected.
■Adjusted the setting field of the fixed footer bar for smartphones.
■Optimized the OGP function and fixed bugs.
※Fixed the output of OGP tags on all pages, and optimized the output of alternative images set in the theme options as og:images on pages that do not have eye-catching images, such as archive pages.
※Modified for SSL WordPress measures.
■Fixed to optimize the output content of META tag (meta description).
■Apply microdata structured markup recommended by google to the breadcrumb list code.
■Fixed a bug that the color of the button is not reflected when using quick tags.

The following are the files that have been modified for this update.
【Fixed files】
404.php
admin/theme-options.php
archive-news.php
breadcrumb.php
functions/custom_editor.php
functions/header-logo.php
functions/ogp.php
functions/seo.php
functions/header.php
index.php
js/jscript.js
languages/ja.mo
languages/ja.po
page.php
page/template_about.php
page/template_access.php
page/template_menu.php
page/template_staff.php
responsive.css
single-news.php
single.php
style.css

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