MDict (.mdx/.mdd) format support

summary

* mdd is complementary resource archive for mdx (dictionary file)
* lzo2 library for (old) MDict version 1 file format
* try Load bass_spx.dll under windows for speex decoding
* internal redirection "@@@LINK=" for both mdx and mdd
Merge pull request #266 from timonwong/dict_mdx_mdd

MDict (mdx/mdd) support