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

config/factions/castle.json

@@ -4,7 +4,6 @@
 		"index" : 0,
 		"nativeTerrain": "grass",
 		"alignment" : "good",
-		"commander" : "zealot",
 		"creatureBackground" :
 		{
 			"120px" : "TPCASCAS",