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/Markers/IBiomeMarkerLayer.cs

@@ -0,0 +1,22 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Parallax.Biomes.Markers;
+
+/// <summary>
+/// Specifies one-off marker points to be used. This could be for dungeon markers, mob markers, etc.
+/// These are run outside of the tile / decal / entity layers.
+/// </summary>
+public interface IBiomeMarkerLayer : IPrototype
+{
+    /// <summary>
+    /// Biome template to use as a mask for this layer.
+    /// </summary>
+    public Dictionary<EntProtoId, EntProtoId> EntityMask { get; }
+
+    public string? Prototype { get; }
+
+    /// <summary>
+    /// How large the pre-generated points area is.
+    /// </summary>
+    public int Size { get; }
+}