Zero out structures when creating houses and rooms

GpApp/House.cpp

@@ -224,6 +224,7 @@ Boolean InitializeEmptyHouse (void)
 	}
 
 	thisHousePtr = *thisHouse;
+	memset(thisHousePtr, 0, houseSizeNoRooms);
 
 	thisHousePtr->version = kHouseVersion;
 	thisHousePtr->firstRoom = -1;

GpApp/Room.cpp

@@ -171,6 +171,8 @@ Boolean CreateNewRoom (short h, short v)
 	char		wasState;
 	
 	CopyThisRoomToRoom();					// save off current room
+
+	memset(thisRoom, 0, sizeof(roomType));
 	
 	PasStringCopy(PSTR("Untitled Room"), thisRoom->name);
 	thisRoom->leftStart = 32;				// fill out fields of new room

GpApp/StructuresInit2.cpp

@@ -182,6 +182,8 @@ void CreatePointers (void)
 	thisRoom = (roomPtr)NewPtr(sizeof(roomType));
 	if (thisRoom == nil)
 		RedAlert(kErrNoMemory);
+
+	memset(thisRoom, 0, sizeof(roomType));
 	
 	hotSpots = nil;
 	hotSpots = (hotPtr)NewPtr(sizeof(hotObject) * kMaxHotSpots);