Improvement of map display setting method

【Corrections/Features Added】
■Fixed a bug that the marker position of the map automatically obtained from the address may be slightly different from the position displayed on Google Maps.
※In case the marker position shifts when the address is specified, a setting field has been added in the theme options so that the marker position can be specified by longitude and latitude.

The following files have been modified for this update.
【Corrected files】
admin/theme-options.php
index.php
languages/ja.mo
languages/ja.po
style.css

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