Aaron Suen 775718256d Fix item entity bugs
- Crash due to pos being non-nil but velocity being nil?!
- Excessive item merging, i.e. on splitting planks, cancelling
  out outward item ejection.  Items now only merge at low
  absolute speed (detecting groups with low relative speed is
  too difficult to do efficiently for now).
2020-06-26 06:11:19 -04:00
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2020-06-26 06:11:19 -04:00
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