Added quick tag and social button functions

【Contents of modification】
■Added original social button setting function (selectable from 4 types of button styles)
■Added quick tag function.
■Responsive table support

The following are the files that have been modified for this update.
【Added files】
icomoon/
※Icon font directory for original social buttons
snsbt_top_color.php
snsbt_top_mono.php
snsbt_btm_color.php
snsbt_btm_mono.php

【Modified files】
admin/theme-options.php
languages/en.po
languages/en.mo
single.php
header.php
functions.php
style.css

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