Dungeon generation refactor (#17121)

Content.Shared/Procedural/PostGeneration/CornerClutterPostGen.cs

@@ -0,0 +1,18 @@
+using Content.Shared.Storage;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Spawns entities inside corners.
+/// </summary>
+public sealed class CornerClutterPostGen : IPostDunGen
+{
+    [DataField("chance")]
+    public float Chance = 0.50f;
+
+    /// <summary>
+    /// The default starting bulbs
+    /// </summary>
+    [DataField("contents", required: true)]
+    public List<EntitySpawnEntry> Contents = new();
+}