Pet Snail expiration + Scripted portal sound effects

Fixed pet Snail not expiring properly (being removed from inventory when the time's up).
Broadcasted code update for most of the missing portal sound effects for portal scripts. It is expected for all scripted portals now to play the sound effect when traversing it.

scripts/portal/mayong.js

@@ -20,6 +20,6 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 function enter(pi) {
-	pi.warp(240020401, "out00");
+	pi.playPortalSound(); pi.warp(240020401, "out00");
 	return true;
 }