いろんなフォントで「open_interval」変換
Zen Old Minchoopen_interval
Yusei Magicopen_interval
M PLUS 1open_interval
Shippori Antiqueopen_interval
Yuji Maiopen_interval
Dela Gothic Oneopen_interval
DotGothic16open_interval
Train Oneopen_interval
Hira Minchoopen_interval
Potta Oneopen_interval
Reggae Oneopen_interval
Stickopen_interval
Zen Kurenaidoopen_interval
Kosugi Maruopen_interval
Rampart Oneopen_interval
Hachi Maru Popopen_interval
New Tegominopen_interval
RocknRoll Oneopen_interval
Kaisei Decolopen_interval
「open_interval」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
