Xelatex support for Korean and Hindi

I added xelatex PDF build for Korean and Hindi.
I found that Hindi conf.py.diff still include section title invisible bug,
but I think that this xelatex way will be good for future.
(For example, for other languages which have not been added yet.)

Details are written in here.
http://osgeo-org.1560.x6.nabble.com/Qgis-community-team-latex-pdf-guru-s-for-failing-Korean-and-Hindi-pdf-build-available-td5145952.html

Regards,