- split heroes.json in manner similar to creatures\factions
- string ID's for H3 heroes
- data in vcmi configs for heroes will replace data in h3 txt's

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3257 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834