Remove distributeEntitiesByHeight / derivateEntitiesByHeight from rP18141 / rP15327.
Fix collisions of mines with trees and berries on Schwarzwald.

It can't achieve anything that a createArea or createObjectGroups call with a HeightConstraint (rP20862) or HeightPlacer (rP15327, rP20361) can't achieve too,
while it can't perform many crucial tasks like testing for arbitrary Constraints, using custom shapes determined by a Placer or limiting the amount of entities,
thus the unconventional code is redundant, refs #4805, #3764.