Revert biome rework (#38724)

* Revert "Fix world generation (#38713)"

This reverts commit 10fa6ff4af.

* Revert "Biome rework (#37735)"

This reverts commit fe7b96147c.

Content.Shared/Procedural/PostGeneration/SplineDungeonConnectorDunGen.cs

@@ -0,0 +1,28 @@
+using Content.Shared.Maps;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Connects dungeons via points that get subdivided.
+/// </summary>
+public sealed partial class SplineDungeonConnectorDunGen : IDunGenLayer
+{
+    [DataField(required: true)]
+    public ProtoId<ContentTileDefinition> Tile;
+
+    [DataField]
+    public ProtoId<ContentTileDefinition>? WidenTile;
+
+    /// <summary>
+    /// Will divide the distance between the start and end points so that no subdivision is more than these metres away.
+    /// </summary>
+    [DataField]
+    public int DivisionDistance = 10;
+
+    /// <summary>
+    /// How much each subdivision can vary from the middle.
+    /// </summary>
+    [DataField]
+    public float VarianceMax = 0.35f;
+}