- fix uninitialized cursor

- stubs for loading heroes and classes from mods (no real code yet)
- heroes loading uses string IDs for secondary skills, some cleanup in HeroHandler

lib/CTownHandler.cpp

@@ -6,6 +6,7 @@
 #include "JsonNode.h"
 #include "StringConstants.h"
 #include "CModHandler.h"
+#include "CArtHandler.h"
 #include "Filesystem/CResourceLoader.h"
 
 /*