Farm entities, local and regional spread, kd-tree vs grid

Christopher Bahrrequested to merge
feature/neighbours into main
  • added farm entities to determine fixed farm neighbors and add flexibility to simulate different farm situations (later within farm spread, management etc.); in later model versions herds can than 'move', be removed and added to farms, e.g moving to a finisher farm
  • kd-tree vs grid: should be enough to only do once after farm-with-herds initiation in world map, with very high number of farms takes a couple of seconds; no big difference between both methods in benchmarking

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