- Fixed some warnings from cppcheck
- Minor improvements to JSON validation
- Cleanup in SDL_Extensions.cpp
- Implemented new propery for creature format: idle animation duration
- Disabled idle animation of some of conflux creatures (was clearly
broken)


git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3605 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834