Extensions for java.nio.charset.CharsetDecoder

charset	expect val CharsetDecoder.charset: Charset Decoder’s charset it is created for.
decode	fun CharsetDecoder.decode(     input: Input,     max: Int = Int.MAX_VALUE ): String expect fun CharsetDecoder.decode(     input: Input,     dst: Appendable,     max: Int ): Int
decodeExactBytes	expect fun CharsetDecoder.decodeExactBytes(     input: Input,     inputLength: Int ): String