* old generators in new api
* add NewMaterialPopulator
* forgot to prevent physics loop
* I see... the new generator creates caves
* apply getMinHeight and getMaxHeight
* getMinHeight and getMaxHeight for populators too
* summarize
* general reformat on populators
* small typos
* comment sections
* small reformat
* warning on config
* apply new API on BlockPopulator p.1
* apply new API on BlockPopulator p.2
* apply new API on BlockPopulator p.3 (final)
* hasAI option