* enum serialization/deserialization (si32 as basetype ought to be enough for anybody)
* some fields in classes refactored to use appropriate enums (not yet finished)

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3141 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834