bigfixing & new file: launcher/jsonutils.cpp
- launcher uses json parser from vcmi lib instead of one from Qt #1469
- fixed abilities overrides for some creatures #1476
- fixed hero portraits in seer huts #1402
- ttf fonts will render text in utf-8 mode. Not really useful at this point
- new settings entry, available in launcher: encoding. Unused for now.

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3551 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834