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/BoundaryWallDunGen.cs

@@ -0,0 +1,23 @@
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Iterates room edges and places the relevant tiles and walls on any free indices.
+/// </summary>
+/// <remarks>
+/// Dungeon data keys are:
+/// - CornerWalls (Optional)
+/// - FallbackTile
+/// - Walls
+/// </remarks>
+public sealed partial class BoundaryWallDunGen : IDunGenLayer
+{
+    [DataField]
+    public BoundaryWallFlags Flags = BoundaryWallFlags.Corridors | BoundaryWallFlags.Rooms;
+}
+
+[Flags]
+public enum BoundaryWallFlags : byte
+{
+    Rooms = 1 << 0,
+    Corridors = 1 << 1,
+}