Optimization of breadcrumb list and bug fixes

【Contents of the fix】
■Apply microdata format structured markup recommended by google to the breadcrumb list code.
■Fixed an issue where unnecessary links are displayed in the upper left corner when the width is between 640px and 655px (adjusted the breakpoints).
■Fixes to resolve errors in php7 environment.

The following files have been modified for this update.
【Corrected files】
admin/theme-options.php
header.php
index.php
languages/en.mo
languages/en.po
style.css
style_sp.css
【Added files】
breadcrumb.php
fonts/design_plus.eot
fonts/design_plus.svg
fonts/design_plus.ttf
fonts/design_plus.woff

For details, please see the download site for purchasers of Precious (tcd019).

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