A few fixes and tweaks

Have been wrangling with saving/loading for the moving platforms, which SHOULD all work ok now. Had some particular problems with platforms triggered by mushrooms. Some have now been taken out completely, but all the remaining ones should be good.

Also (I believe) fixed the door of the dumb waiter in the dining room.

Finally, have adjusted how events are re-processed after loading. If you see any issues with solved puzzles not persisting after a load, let me know!