Although the previous commit fixed a big problem, it was rather slow (MultiplyPoint3x4 is MUCH faster than transform.position). Since we're trying to improve performance here rather than make it worse, let's go back to the old system, but make PlayerCorpse manually call EnsurePointsInitialized early, which gets the data before physics have a chance to go crazy and end up with us caching very weird limb positions (happens sometimes on loading existing ragdolls from a save)