いろんなフォントで「mine_field」変換
Zen Old Minchomine_field
Yusei Magicmine_field
M PLUS 1mine_field
Shippori Antiquemine_field
Yuji Maimine_field
Dela Gothic Onemine_field
DotGothic16mine_field
Train Onemine_field
Hira Minchomine_field
Potta Onemine_field
Reggae Onemine_field
Stickmine_field
Zen Kurenaidomine_field
Kosugi Marumine_field
Rampart Onemine_field
Hachi Maru Popmine_field
New Tegominmine_field
RocknRoll Onemine_field
Kaisei Decolmine_field
「mine_field」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
