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

@@ -172,6 +172,8 @@ Boolean CreateNewRoom (short h, short v)
 	
 	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
 	thisRoom->rightStart = 32;

GpApp/StructuresInit2.cpp

@@ -183,6 +183,8 @@ void CreatePointers (void)
 	if (thisRoom == nil)
 		RedAlert(kErrNoMemory);
 
+	memset(thisRoom, 0, sizeof(roomType));
+	
 	hotSpots = nil;
 	hotSpots = (hotPtr)NewPtr(sizeof(hotObject) * kMaxHotSpots);
 	if (hotSpots == nil)