Extract door object type test to ObjectStruct method

This removes the direct reference to _object_id values in path.cpp, that enum is now only used in objects.h/cpp

Source/objects.h

@@ -121,6 +121,15 @@ struct ObjectStruct {
 		SetMapRange(mapRange);
 		_oVar8 = leverID;
 	}
+
+	/**
+	 * @brief Check if this object is a door
+	 * @return True if the object is one of the door types (see _object_id)
+	 */
+	bool IsDoor() const
+	{
+		return IsAnyOf(_otype, _object_id::OBJ_L1LDOOR, _object_id::OBJ_L1RDOOR, _object_id::OBJ_L2LDOOR, _object_id::OBJ_L2RDOOR, _object_id::OBJ_L3LDOOR, _object_id::OBJ_L3RDOOR);
+	}
 };
 
 extern ObjectStruct Objects[MAXOBJECTS];

Source/path.cpp

@@ -78,7 +78,7 @@ bool IsTileWalkable(Point position, bool ignoreDoors)
 {
 	if (dObject[position.x][position.y] != 0) {
 		int oi = abs(dObject[position.x][position.y]) - 1;
-		if (ignoreDoors && IsAnyOf(Objects[oi]._otype, OBJ_L1LDOOR, OBJ_L1RDOOR, OBJ_L2LDOOR, OBJ_L2RDOOR, OBJ_L3LDOOR, OBJ_L3RDOOR))
+		if (ignoreDoors && Objects[oi].IsDoor())
 			return true;
 		if (Objects[oi]._oSolidFlag)
 			return false;