Unicode support.
- boost-locale library is now required (boost 1.48 or higher)
- Unicode namespace that contains UTF-8 handling
- All non-ASCII strings from H3 data will be converted to UTF-8 during loading
- All JSON files MUST use UTF-8. 
- H3 data encoding can be selected via launcher or directly in config file

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3596 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834