#6 support for other language encoding

[Anonymous]

Add support for client in other language code encoding(big5, GBK, etc), now only support unicode and japanese.
It is better to replace the nkfwrap which only support japanese, using libiconv instead can support convert from unicode to any other encoding.
Since many NAS store file in unicode, and cannot convert to the specific encoding which the DMA player can display.

Thanks.