cave is one of the distribution types provided by CoFH
World. It distributes features in the floors or ceilings of caves.
It does so by randomly picking X and Z coordinates and a Y coordinate below
ground, finding the nearest cave (if any), and placing features in the cave’s
floor or ceiling at those X and Z coordinates.
If a cave cannot be found at randomly chosen coordinates, it still counts
towards the value
cluster-count of the feature
When using this distribution type, the following values may be added to the feature entry.
||Number / number provider||(Taken from world)||The altitude below which to look for caves to distribute features in. Evaluated once per feature.|