Aaron Suen 361f69065d Make mapgen disable logic a bit more dynamic.
Mods may change singlenode mapgen to generate stone,
in which case we want them to be able to also reenable
the standard mapgen_shared hooks.

- If def.enabled == true, always run the hook.
- If def.enabled == false, never run it.
- If def.enabled is not set (nil) then run it based on
  standard logic, i.e. not on singlenode.
2020-01-12 11:01:30 -05:00
..
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