VGRoid support (#27659)

* Dungeon spawn support for grid spawns

* Recursive dungeons working

* Mask approach working

* zack

* More work

* Fix recursive dungeons

* Heap of work

* weh

* the cud

* rar

* Job

* weh

* weh

* weh

* Master merges

* orch

* weh

* vgroid most of the work

* Tweaks

* Tweaks

* weh

* do do do do do do

* Basic layout

* Ore spawning working

* Big breaking changes

* Mob gen working

* weh

* Finalising

* emo

* More finalising

* reverty

* Reduce distance

Content.Shared/Procedural/PostGeneration/DungeonEntranceDunGen.cs

@@ -0,0 +1,18 @@
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Selects [count] rooms and places external doors to them.
+/// </summary>
+/// <remarks>
+/// Dungeon data keys are:
+/// - Entrance
+/// - FallbackTile
+/// </remarks>
+public sealed partial class DungeonEntranceDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// How many rooms we place doors on.
+    /// </summary>
+    [DataField]
+    public int Count = 1;
+}