Revert biome rework (#38724)

* Revert "Fix world generation (#38713)"

This reverts commit 10fa6ff4af.

* Revert "Biome rework (#37735)"

This reverts commit fe7b96147c.

Content.Shared/Parallax/Biomes/Layers/BiomeMetaLayer.cs

@@ -0,0 +1,27 @@
+using Robust.Shared.Noise;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+/// <summary>
+/// Contains more biome layers recursively via a biome template.
+/// Can be used for sub-biomes.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed partial class BiomeMetaLayer : IBiomeLayer
+{
+    [DataField("noise")]
+    public FastNoiseLite Noise { get; private set; } = new(0);
+
+    /// <inheritdoc/>
+    [DataField("threshold")]
+    public float Threshold { get; private set; } = -1f;
+
+    /// <inheritdoc/>
+    [DataField("invert")]
+    public bool Invert { get; private set; }
+
+    [DataField("template", required: true, customTypeSerializer: typeof(PrototypeIdSerializer<BiomeTemplatePrototype>))]
+    public string Template = string.Empty;
+}