reimplement aether stuff from personal repo

Minecraft.World/AetherBiome.cpp

@@ -0,0 +1,50 @@
+#include "stdafx.h"
+#include "AetherBiome.h"
+#include "AetherBiomeDecorator.h"
+#include "net.minecraft.world.entity.monster.h"
+#include "net.minecraft.world.level.tile.h"
+#include "net.minecraft.world.level.levelgen.feature.h"
+
+AetherBiome::AetherBiome(int id) : Biome(id)
+{
+	// Clear all mob spawning lists
+	enemies.clear();
+	friendlies.clear();
+	friendlies_chicken.clear();
+	friendlies_wolf.clear();
+	waterFriendlies.clear();
+
+	// Aether surface blocks
+	topMaterial = (byte) Tile::aetherGrass_Id;
+	material = (byte) Tile::aetherDirt_Id;
+
+	// Use custom decorator
+	delete decorator;
+	decorator = new AetherBiomeDecorator(this);
+}
+
+Feature *AetherBiome::getTreeFeature(Random *random)
+{
+	// 10% chance for golden oak, 90% for skyroot
+	if (random->nextInt(10) == 0)
+	{
+		return new GoldenOakTreeFeature(false);
+	}
+	return new SkyrootTreeFeature(false);
+}
+
+Feature *AetherBiome::getGrassFeature(Random *random)
+{
+	// Regular tall grass (type 1) — will be colored by biome grass color
+	return new TallGrassFeature(Tile::tallgrass_Id, 1);
+}
+
+int AetherBiome::getGrassColor()
+{
+	return 0x8ab69a;
+}
+
+int AetherBiome::getFolageColor()
+{
+	return 0x8ab69a;
+}