Patch notes:

 * New teacher and new gym/sports scenes added
 * Some sprite adjustments for Raven
 * Current-day indicator added in the diary (placeholder)
 * Some adjustments to Flirty dialog to be a little less het-focused
 * No longer enter the dungeon on top of the up stairs when you enter it
   on week3 after having already entered.
 * Minor dialog fixes
 * Wing-crop adjustments.
 * Better error-reporting for serialisation bugs that mess up saves    after monsters move in the dungeon (it's still broken, we're still    working on it)
 * No longer return to the main menu on Oct 12 if you knew Kyo liked Minnie    (still need to fix fade errors)
 * No longer crash when loading dungeon timers with no callback.
 * Pulled out broken atmosphere diffusion code that wasn't actually being used.
   This should fix some save warnings and crashes related to GloomyAir.
 * Should no longer try to teleport Sparkle()s (or other Monster()s) into
   niches. That should stop a crash where the sparkle fails to pathfind back
   to you.
 * Notification when Shield blocks damage.
 * Shield now blocks magical status effects from being applied to you.
 * Started the spell retargeting framework. This is the underlayer for Reflect,
   Ground Spell, and some Shield effects.
 * You can now only Shield yourself.
 * You can no longer Push and Force Push yourself when shielded.
 * Slow no longer applied twice.
 * No longer crash loading saves made with the diary up on Sunday.
 * Dialog box falls out on transition into week3 dungeon (reentry)
 * Transition between pre-roll gym events and Exercising... smoothed out,
   music change moved after the decision whether or not to call an event.