For a description of this Minetest mod, please refer to the forum topic: https://forum.minetest.net/viewtopic.php?f=9&t=10265

TODO:

• Mapgen: Find a way to get the perlin noise values inside [-1; 1] or use another noise. The problem is visible in the nether forest, where the mapgen code flattens the ceiling if it is very high.
• Mapgen: Generate more detail inside the simple pyramid-like "buildings", e.g. add a small treasure chest node which contains items