Fix an item duplication glitch
Various fixes
Chargen updates
Fix an AABB assert for loading empty exterior cells
Don't crash when trying to delete a reference that doesn't exist anymore
Use the non-accumulation root's parent as the accumulation root

This relies on the non-accumulation root not being the skeleton root. I haven't
found an instance where this isn't the case.
Use a smaller static geometry size for interior cells
Fix actor stepping
Remove unused functions and parameters
Merge remote-tracking branch 'scrawl/master'
Merge remote-tracking branch 'kcat/misc-cleanup'