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/DungeonGenerators/ExteriorDunGen.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.DungeonGenerators;
+
+/// <summary>
+/// Generates the specified config on an exterior tile of the attached dungeon.
+/// Useful if you're using <see cref="GroupDunGen"/> or otherwise want a dungeon on the outside of a grid.
+/// </summary>
+public sealed partial class ExteriorDunGen : IDunGenLayer
+{
+    [DataField(required: true)]
+    public ProtoId<DungeonConfigPrototype> Proto;
+}