文件编码检查和转换工具

自动识别下列编码格式，并且可以在不同编码之间转换。

GBK
US-ASCII
ISO-8859-1
utf-8_withoutBom
utf-8_withBom
UTF-16BE_withBom
UTF-16BE_withoutBom
UTF-16LE_withBom
UTF-16LE_withoutBom
UTF-32BE_withBom
UTF-32BE_withoutBom
UTF-32LE_withBom
UTF-32LE_withoutBom