Aaron Suen 943604cf95 Scaling overhaul.
- Remove pummel recipes.  Now find handholds just by
  staring at a particular spot.  Being closer or better focused
  helps.
- Use only particles instead of a facedir node, so facedir
  isn't a problem when adjacent to multiple walls/ceilings.
- Automatically upgrade "wall" climbing to "overhang" climbing
  when a ceiling is present.
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