No-crash-mode

So killing Giant Amoebas doesn't crash the game anymore. That's not
because they're "fixed" though. In attempting to just not call their
buggy "on-death" function in destructible, killing a Giant Amoeba won't
crash the game, but you WILL be responsible for a level-wide
insta-genocide of Giant Amoebas.
Heisenbug

Tried looking at why the anhilation of G.Amoeba's occurred. Then it
stopped happening. Might have something to do with their proximity
maybe...
Merge branch 'master' of https://github.com/dunjeon-masters/dunjeon-crawler