Rewritten battle obstacles. New file for lib: CObstacleInstance.cpp.

Now obstacles should be placed exactly like they were in OH3. 
All problems with displaying obstacles in battlefield should be gone. They should be now matched to the single pixel. 
If there are still some discrepancies, please report them.

lib/GameConstants.h

@@ -187,6 +187,7 @@ namespace Obj
 		BOAT = 8,
 		CREATURE_BANK = 16,
 		CREATURE_GENERATOR1 = 17,
+		CURSED_GROUND1 = 21,
 		DERELICT_SHIP = 24,
 		DRAGON_UTOPIA = 25,
 		GARRISON = 33,
@@ -194,6 +195,7 @@ namespace Obj
 		MONOLITH1 = 43,
 		MONOLITH2 = 44,
 		MONOLITH3 = 45,
+		MAGIC_PLAINS1 = 46,
 		SCHOOL_OF_MAGIC = 47,
 		MINE = 53,
 		MONSTER = 54,
@@ -209,6 +211,35 @@ namespace Obj
 		WHIRLPOOL = 111,
 		BORDER_GATE = 212,
 		GARRISON2 = 219,
+		CLOVER_FIELD = 222,
+		CURSED_GROUND2 = 223,
+		EVIL_FOG = 224,
+		FAVORABLE_WINDS = 225,
+		FIERY_FIELDS = 226,
+		HOLY_GROUNDS = 227,
+		LUCID_POOLS = 228,
+		MAGIC_CLOUDS = 229,
+		MAGIC_PLAINS2 = 230,
+		ROCKLANDS = 231,
+	};
+}
+
+//follows ERM BI (battle image) format
+namespace BattlefieldBI
+{
+	enum
+	{
+		NONE = -1,
+		COASTAL,
+		CURSED_GROUND,
+		MAGIC_PLAINS,
+		HOLY_GROUND,
+		EVIL_FOG,
+		CLOVER_FIELD,
+		LUCID_POOLS,
+		FIERY_FIELDS,
+		ROCKLANDS,
+		MAGIC_CLOUDS,
 	};
 }