changes in hero class format:
- new property: affinity (might/magic) since in mods it is impossible to
rely on odd/even numeric indexes
- property commander is now part of hero class


git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3651 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834