some changes towards editing H3 objects via mods. Should be stable, report if not.
- removed duplicated json loading code in handlers
- simpler and mod-friendly handling of combined artifacts
- reorganized CCreature to avoid huge number of fields in one structure

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3251 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834