guard the WorldPointer against UB #83
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Resolves #82
Prevents
WorldPointers from seeing an invalid*mut Worldby wrapping it in anOptionthat getstaken when the originalWorldPointerGuardgets dropped.Also adding a couple of blocking variants of the existing
read/writemethods since I'm not in love with the current panic-rather-than-block semantics. I would probably advocate for inverting them and block by default, but I didn't want to shake things up too much.