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- Attempt to fix flying in skyrealm.  Measure the distance downward to
  ignores, and require actual downward velocity unless ignores are
  closer than a certain distance.

- Downstream moddability improvements.
	- Convert to modpack, separate out API, crafting, mapgen, portals?
	- Make things hookable/overridable, like teleportations.

- Add lots more logging
	- Players teleporting in/out
	- Things captured when falling
	- Things restored to surface

- Instead of always returning players to the portal they entered from,
  try to return them to a portal specific to their particular skyblock
  if one can be found in cache.

- When falling nodes are returned, should probably raycast from the
  player outward to make it possible to sanely contain falling_node
  ents within a "portal room".

- Do "bump up" logic on return from skyrealm, same as travel to?

- Add a recipe to destroy portals.
	- Maybe keep a global list somewhere and require that there
	  be at least one remaining to each block?

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