- add to specify the file name format based on https://github.com/furyutei/twOpenOriginalImage (ver.0.1.8.20)
[{mm}-{dd}]({username}){tweet_id}_img{i}.{ext}
=> [10-06](Google)1445486492734816268_img1.jpg
/* filename:
* {base}
* tweet create date:
* {yyyy} => fullyear
* {mm} => month
* {dd} => day
* {HH} => hours
* {MM} => minutes
* {SS} => seconds
* author:
* {fullname} => nickname
* {username} => account
* image index:
* {i} => 1, 2, ...
* tweet id:
* {tweet_id}
* tweet text:
* {twtext} => first line only
* suffix:
* {suffix} => '-orig'
* extension:
* {ext}
*/