A minor update

This is a minor update, but is categorised as "Version 2" rather than "Version 1.1" or whatever due to the way Inform handles version control. (It follows on from practises developed at Infocom.)

The only change here is that now the command WAVE has been added, and works the same as SHAKE. So now you can use WAVE WAND as well as SHAKE WAND to entertain Poppy, Minki and Petey (well, not so much Petey).