Multiple bug fixes

【Contents of the fix】
■【iPhone】Fixed an issue where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■SSL support for “Google Custom Search” widget.
■Fixed a bug in the display settings in the theme options “Schedule”.
(Fixed a bug where “Show Thumbnails” and “Show Schedule Tags” in the basic settings were not being applied.)

The following files have been modified for this update.

【Modified files】
admin/inc/event.php
css/footer-bar.css
functions/update_notifier.php
languages/ja.mo
languages/ja.po
single-event.php
style.css
template-parts/footer-bar.php
widget/google_search.php

【Added files】
img/common/hatenabookmark-logomark.svg

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