Mycus tweaks

Perfect is the enemy of good-enough.

But that means that we release fixes.  This clears up addictions after getting the Marloss color mutations/threshold, bars eating marloss fruits after getting Mycus, and adds minor Marlossification when eating a mycus fruit post-thresh, so folks are less likely to run short.

(That said: they're a food source, not a mutagen.  Ration 'em!)