Correct placement of non-overlapping objects.

lib/mapObjects/ObjectTemplate.h

@@ -62,6 +62,8 @@ public:
 
 	// Checks if object is visitable from certain direction. X and Y must be between -1..+1
 	bool isVisitableFrom(si8 X, si8 Y) const;
+	int3 getVisitableOffset() const;
+	bool isVisitableFromTop() const;
 
 	// Checks if object can be placed on specific terrain
 	bool canBePlacedAt(ETerrainType terrain) const;